Lots of anagrams, but all very smooth!

Across

1

Unfortunately hotel is very unfriendly (7)
HOSTILE — anagram (unfortunately) of HOTEL IS

5

Bad pirates trudge (7)
TRAIPSE — anagram (bad) of PIRATES

9

Aussie singer and model talk inside (5)
DELTA — hidden inside moDEL TAlk

10

Tiny measurement meant reno was bungled (9)
NANOMETRE — anagram (bungled) of MEANT RENO

11

Insignificant sounds after I feed inquisitive bird (5,5)
NOISY MINER — homophone of MINOR (insignificant) after I inside NOSY (inquisitive)

12

Wager assumes a defeat (4)
BEAT — A inside BET (wager)

14

Occasionally, events of yore reimagined (5,2,5)
EVERY SO OFTEN — anagram (reimagined) of EVENTS OF YORE

18

Undesirables eat barbarian for breakfast (5,3,4)
BACON AND EGGS — CONAN (barbarian) inside BAD EGGS (undesirables)

21

Surround sound (4)
RING — double def.

22

Seems miser redesigned entrances (10)
MESMERISES — anagram (redesigned) of SEEMS MISER

25

Ruthlessly cut back big industry testing (9)
EXAMINING — reversal (back) of AXE (ruthlessly cut), MINING (big industry)

26

Sampled the range in eating delicious starters (5)
TRIED — first letters of The Range In Eating Delicious

27

Horse feeder understands verbal backchat (4,3)
NOSE BAG — homophone of KNOWS (understands), then reversal (back) of GAB (chat)

28

Crowds right into beachwear (7)
THRONGS — R (right) inside THONGS (beachwear)

Down

1

Hushing up hammering (6)
HIDING — double def.

2

Second Ferrell movie: that is me on film? (6)
SELFIE — S (second) ELF (Ferrell movie) IE (that is)

3

Touring in teeny van regardless (2,3,5)
IN ANY EVENT — anagram (touring) of IN TEENY VAN

4

Even keen end up in boredom (5)
ENNUI — even letters of kEeN eNd Up In

5

Teens seen transforming US state (9)
TENNESSEE — anagram (transforming) of TEENS SEEN

6

Points at sloth with odd mask (4)
AIMS — AI (sloth) with odd letters of MaSk

7

I bug rising specialists and those being treated (8)
PATIENTS — reversal (rising) of I TAP (bug), ENTS (specialists)

8

Voting in building, switching right to left (8)
ELECTING — ErECTION (building), r (right) -> L (left)

13

Spooner's one incorrectly quoting composer (10)
SONGWRITER — Spoonerism of WRONG CITER

15

Trended when dropping fringe band depiction (9)
RENDERING — tRENDEd without outside letters, RING (band)

16

Wild bear finds its home outside English or Scottish city (8)
ABERDEEN — anagram (wild) of BEAR, DEN (its home) outside E (English)

17

Disgraces company head in summer shoes (8)
SCANDALS — C (first letter of company) inside SANDALS (summer shoes)

19

Leo's one chasing top marks for set task (6)
ASSIGN — SIGN (Leo's one) after AS (top marks)

20

Confidential remarks for best teams (6)
ASIDES — cryptic def.

23

May's power (5)
MIGHT — double def.

24

Bumping head, scale branch (4)
LIMB — cLIMB without first letter