Support provided when apprehended by officer (4)
I believe the answer is:
lift
'support' is the definition.
(thesaurus)
'when apprehended by officer' is the wordplay.
'when' becomes 'if'.
'apprehended by' is an insertion indicator (I've seen this in other clues).
'officer' becomes 'lt' (I've seen this in other clues).
'if' inserted inside 'lt' is 'LIFT'.
'provided' acts as a link.
(Other definitions for lift that I've seen before include "Steal (colloq.); elevator" , "Free ride" , "Raise, elevate" , "Raise - hoist" , "Exalt" .)