Press one criminal for answer (8)
I believe the answer is:
response
'for answer' is the definition.
(synonyms)
'press one criminal' is the wordplay.
'criminal' indicates an anagram.
'press'+'one'='pressone'
'pressone' with letters rearranged gives 'RESPONSE'.
(Other definitions for response that I've seen before include "Answer - retort" , "Sees porn (anag) - answer" , "See porn (anag) -- answer" , "bid by partner" , "counter" .)