Frustrate detectives needing a parking place (10)
I believe the answer is:
disappoint
'frustrate' is the definition.
(I know that disappoint has the is a more specific form of the action frustrate)
'detectives needing a parking place' is the wordplay.
'detectives' becomes 'dis' (Detective Inspectors, DIs).
'needing' is a charade indicator (letters next to each other).
'parking' becomes 'p' (abbreviation on road signs).
'place' becomes 'point' ().
'dis'+'a'+'p'+'point'='DISAPPOINT'
(Other definitions for disappoint that I've seen before include "Let down" , "Fail to satisfy" .)