Very anagram-heavy, but a pretty straightforward puzzle all things told.

Across

1

Football clubs implicated in rigging of score (6)
SOCCER — anagram (rigging) of SCORE with C (clubs)

4

Recalling of party food is a little bit strange (6)
ODDISH — reversal (recalling) of DO (party), DISH (food)

9

Theatre worker had agents all over the place (9)
STAGEHAND — anagram (all over the place) of HAD AGENTS

10

Residents of Cheviot, a goldmining area of NZ? (5)
OTAGO — hidden in cheviOT A GOldmining

11

A terrible crime committed by a powerful nation (7)
AMERICA — A, anagram (terrible) of CRIME, A

12

Pile dishes in waste disposal units (7)
NAPPIES — NAP (pile) PIES (dishes)

13

Cooked enough ribs for the people next door (10)
NEIGHBOURS — anagram (cooked) of ENOUGH RIBS

15

Heartless animal is excessively orderly and fussy? (4)
ANAL — ANimAL without middle letters

17

Opening of torrid set ruined match (4)
TEST — T (first letter of torrid) anagram (ruined) of SET

18

Pigs involved in drunken spree with high roller (3,7)
BIG SPENDER — anagram (involved) of PIGS inside BENDER (drunken spree)

21

Spot sloppy slime in emptied bath? (7)
BLEMISH — BH (bath without middle letters) around anagram (sloppy) of SLIME

22

Leave a music group playing (7)
ABANDON — A BAND (music group) ON (playing)

24

Not one in charge of a paper is prominent (5)
NOTED — NOT ED (one in charge of a paper)

25

Public votes to silence broadcast (9)
ELECTIONS — anagram (broadcast) of TO SILENCE

26

Ends of buffer zone reconstructed with metal (6)
BRONZE — BR (outside letters of buffer) anagram (reconstructed) of ZONE

27

Capital city in Switzerland filled with cyclists at the centre (6)
BERLIN — BERN (city in Switzerland) containing LI (middle letters of cyclists)

Down

1

USA isn't prepared to keep going (7)
SUSTAIN — anagram (prepared) of USA ISN'T

2

Really want chicken with tail plucked (5)
CRAVE — CRAVEn (chicken, without last letter)

3

Vision of course filmed by rowing crew (8)
EYESIGHT — YES (of course) inside EIGHT (rowing crew)

4

Lowly-ranked sailors relocated, say, in modern era (8,6)
ORDINARY SEAMEN — anagram (relocated) of SAY IN MODERN ERA

5

Bowed door fixed with ply except in the middle (6)
DROOPY — anagram (fixed) of DOOR, PlY without middle letter

6

Posted numerical fact, one used in identification (9)
STATIONED — STAT (numerical fact) ID (identification) containing ONE

7

One ice cream has spoilt pasta meal (8,6)
MACARONI CHEESE — anagram (spoilt) of ONE ICE CREAM HAS

8

Ambassador misleads leaders from Uganda and Libya (6)
CONSUL — CONS (misleads) U L (first letters of Uganda, Libya)

14

Police officer in power entering subdivision (9)
INSPECTOR — IN, P (power) inside SECTOR (subdivision)

16

Witty conversation on tee after average score (8)
REPARTEE — RE (on) PAR (average score) TEE

17

Garbage collector in tower assembled pipes (6)
TUBING — BIN (garbage collector) inside TUG (tower)

19

Group linked to offence gets involved with talkback (5,2)
RINGS IN — RING (group) SIN (offence)

20

Covered skin mostly addressed by study (6)
HIDDEN — HIDe (skin, without last letter) DEN (study)

23

Amusing master raised learner (5)
DROLL — reversal (raised) of LORD (master), L (learner)