Fun words, although rather laden with pop culture! Lots of hiddens and first letters, but all pretty easy as expected.

Across

1

A rotisserie rod around hotel fireplace receptacle (6)
ASHPIT — A SPIT (rotisserie rod) around H (hotel)

5

Power of Star Wars thief left one Tolkien creature earth (3,5)
THE FORCE — THiEF without i (one), ORC (Tolkein creature) E (earth)

9

Show Shriver holding Federer pointless! (7)
PROGRAM — PAM (Shriver) around ROGeR (Federer without e, point)

10

Alien's unusual medical solution (6)
SALINE — anagram (unusual) of ALIEN'S

11

Hand model I've romantically embraced (7)
DELIVER — hidden in moDEL I'VE Romantically

12

Governor-General, wearing new beard, congratulated herself (7)
BRAGGED — GG (governer-general) in anagram (new) of BEARD

13

Cruise into South Africa with church organ (7)
STOMACH — TOM (Cruise) inside SA (South Africa), CH (church)

16

Heartless ump fixed unlikely result (5)
UPSET — UP (ump without middle letter), SET (fixed)

17

LR's corvid sounds small (5)
MICRO — homophone of MY (LR's) CROW (corvid)

19

Buddha, is seminar content about Jesus? (7)
MESSIAH — reversal (about) of hidden in buddHA IS SEMinar

22

Add water to reportedly conceal speed (7)
HYDRATE — homophone of HIDE (conceal) RATE (speed)

23

Newspaper boss steers US comedian (2,5)
ED HELMS — ED (newspaper boss) HELMS (steers)

26

It's addictive, symptomatic of feeling content (6)
COFFEE — hidden in symptomatiC OF FEEling

27

Astronomer starts to give another lesson in large European observatory (7)
GALILEO — first letters of Give Another Lesson In Large European Observatory

28

Health of water supply by Scottish lake (8)
WELLNESS — WELL (water supply) LOCH (Scottish lake)

29

Ask Katy about timeless boats (6)
KAYAKS — anagram (about) of ASK KAtY without t (time)

Down

2

Uber carrying pothead, heading to supermarket for meals (7)
SUPPERS — SUPER (uber) around P (first letter of pot), S (first letter of supermarket)

3

Six studio outsiders follow professional rider (7)
PROVISO — PRO (professional) VI (six) SO (outside letters of studio)

4

Curt Petersen's secret (5)
TERSE — hidden in peTERSEn

5

Self-addressed book? (4)
TOME — cryptic def.

6

Used horns, playing covers (9)
ENSHROUDS — anagram (playing) of USED HORNS

7

Serves timelapses from new blogsite (7)
OBLIGES — anagram (new) of BLOGSItE without t (time)

8

Translate secret about Newton (7)
CONVERT — COVERT (secret) around N (Newton)

14

Sailor’s shout: Hey, the oar broke! (4,5)
AHOY THERE — anagram (broke) of HEY THE OAR

15

That bloke listening to church song (3)
HIM — homophone of HYMN (church song)

17

Spooner to reimburse double agent for folk dance centrepiece (7)
MAYPOLE — Spoonerism of PAY (reimburse) MOLE (double agent)

18

Guarded vehicle with experimental fuel (7)
CAREFUL — CAR (vehicle) anagram (experimental) of FUEL

20

Ride without Republican friend preferably (7)
IDEALLY — rIDE without r (republican) ALLY (friend)

21

Laugh with head of morgue and ridicule resting place (7)
HAMMOCK — HA (laugh) M (first letter of morgue) MOCK (ridicule)

24

Sci-fi villain beginning to drink beer with king (5)
DALEK — D (first letter of drink) ALE (beer) K (king)

25

Gets on gunboat's prow in choppy sea (4)
AGES — G (first letter of gunboat) in anagram (choppy) of SEA