Virtuous, but possibly cheats (6)
I believe the answer is:
chaste
'virtuous' is the definition.
('chaste' can be similar in meaning to 'virtuous')
'possibly cheats' is the wordplay.
'possibly' indicates an anagram.
'cheats' is an anagram of 'CHASTE'.
'but' acts as a link.
(Other definitions for chaste that I've seen before include "Sachet (anag)" , "Untarnished" , "Set Cha up for being pure" , "Showing virtue of kind" , "Pure and virginal" .)