Prudence gets uncivil (4)
I believe the answer is:
rude
'uncivil' is the definition.
(synonyms)
'prudence gets' is the wordplay.
'gets' indicates the answer is hidden within the clue.
'RUDE' is hidden within 'prudence'.
(Other definitions for rude that I've seen before include "Impolite - obscene" , "Robust - roughly made" , "discourtesy" , "Uncouth" , "Impertinent" .)