Posed with one's works, revealed as adequate (12)
I believe the answer is:
satisfactory
'adequate' is the definition.
(similar in meaning)
'posed with one's works' is the wordplay.
'posed' becomes 'sat' ('sit' can be a synonym of 'pose').
'with' is a charade indicator (letters next to each other).
'one's' becomes 'is' (Roman numeral).
'works' becomes 'factory' (factory is a kind of works).
'sat'+'is'+'factory'='SATISFACTORY'
'revealed as' acts as a link.
(Other definitions for satisfactory that I've seen before include "Acceptable - adequate" , "unexceptional" , "Meeting expectations" , "Good enough" , "Up to scratch" .)