Criminal is captured displaying classic comedy prop (7,3)
I believe the answer is:
custard pie
'classic comedy prop' is the definition.
(as in a custard pie pushed in someone's face)
'criminal is captured' is the wordplay.
'criminal' is an anagram indicator.
'is'+'captured'='iscaptured'
'iscaptured' is an anagram of 'CUSTARD PIE'.
'displaying' acts as a link.
(Other definitions for custard pie that I've seen before include "Item thrown in slapstick comedy" , "Slapstick missile" , "What featured in comedy" , "But is one thrown" , "Element of slapstick" .)