Press one violently for answer (8)
I believe the answer is:
response
'answer' is the definition.
('response' can be a synonym of 'answer')
'press one violently' is the wordplay.
'violently' indicates an anagram.
'press'+'one'='pressone'
'pressone' anagrammed gives 'RESPONSE'.
'for' acts as a link.
(Other definitions for response that I've seen before include "Answer - reaction" , "comeback" , "Acknowledgement" , "Reply, rejoinder" , "Sees porn (anag) - answer" .)