Body parts strewn around the grid.
ACROSS
1 Shrewd missus seduces, conceals (6) SUSSED [T]
4 Visitor's vehicle parked outside alley is stripped (6) CALLER {CA{
9 Pitcher's against including an oriental (4)
10 Hardware store supplying ROM, almost ignores North (10) IRONMONGER {ROM+IGNORE
11 USSR disintegrated, primarily into a different country (6) RUSSIA {USSR*}{I
12 Agent in disguise traps Asian and evacuates elder youth (8) TEENAGER {AGENT* over E}{E
13 To humbly ask for help, auditor comes to quiet worker in between (3,2,4)
15 Cross verify missing condition (5) TESTY TEST
16 Silly ploy backfires, nothing in it (5) LOOPY {O} in PLOY*
18 The circle could start dynamic form of government (9) THEOCRACY {THE}{O}{C
22 Heart has failed leading to an inflammatory condition (4,4) HEAT RASH*
23 Cost manipulated in getting an alarm bell (6) TOCSIN {COST*}{IN}
25 Show pity according to experience of a hater reborn (4,1,5) HAVE A HEART {HAVE} {A} {HATER*}
26 Meet was regularly held in a row of buildings (4) MEWS {M
27 Mass at old city near England finished (6) MATURE {M}{AT}{UR}{E}
28 Conservative bishop found in kinky orgy with a humanoid robot, maybe (6) CYBORG {C}{Y{B}ORG*}
DOWN
1 Well, thanks for including university academic in making a medical instrument (7) SPATULA {SPA}{T{U}{L}A}
2 Glasses procured by police officer with some EMI at cost regularly (5) SPECS {SP}{E
3 Inscription is what eastern religious path's about (7) EPITAPH {E}{PI}{PATH*}
5 Forge metal; take reading to make an ornament (6) ARMLET {R} in METAL*
6 Listen, love and death's related, answer lies within (4,2,3) LEND AN EAR {L}{END} {A} {NEAR}
7 Once more choose spin; Thirimanne finally will get caught (2-5) RE-ELECT {RE-EL}{
8 Noted thief has bungled; Stupid (4,2,3,4) SOFT IN THE HEAD*
14 Hospital dweller gets certificate about his heart, after a point (9) INPATIENT {1}{N}{PAT{
17 A type of pitch, unused by thrower, maybe (7) OVERARM {OVER}{ARM}
19 Endure auto's thievery, extremely corrupt (7) OUTSTAY {AUTOS+T
20 Lunch in Wagah to have a chat (7) CHINWAG [T]
21 Sailor returns with the river swimmer perhaps (6) BATHER {BA<=}{THE}{R}
24 Arrived with nothing for performance (5) CAMEO {CAME}{O}