Part of community (4)
I believe the answer is:
unit
'part' is the definition.
(unit is a kind of part)
'of community' is the wordplay.
'of' indicates the answer is hidden within the clue.
'UNIT' is hidden within 'community'.
(Other definitions for unit that I've seen before include "Separate part" , "Individual thing or group regarded as complete" , "Single undivided entity" , "hospital department" , "Individual thing; one" .)