Single item in community (4)
I believe the answer is:
unit
'single item' is the definition.
(I've seen this in another clue)
'in community' is the wordplay.
'in' indicates a hidden word.
'UNIT' can be found hidden inside 'community'.
(Other definitions for unit that I've seen before include "Quantity chosen as standard, or individual thing" , "Self-contained section" , "One; military group" , "Entity, system; component group" , "Operational team" .)