This compiler's mature figure (5)
I believe the answer is:
image
'figure' is the definition.
(I know that figure can be written as image)
'this compiler's mature' is the wordplay.
'this compiler's' becomes 'im' (I've seen this in other clues).
'mature' becomes 'age' (synonyms).
'im'+'age'='IMAGE'
(Other definitions for image that I've seen before include "Mental or physical representation" , "Pictorial representation" , "Mental picture; metaphor" , "Copy" , "Epitome" .)