Humble saint, after a fashion (6)
I believe the answer is:
modest
'humble' is the definition.
('modest' can be a synonym of 'humble')
'saint after a fashion' is the wordplay.
'saint' becomes 'st'.
'after' is a charade indicator (letters next to each other).
'a fashion' becomes 'mode' ('mode' can be a synonym of 'fashion'**).
'st' put after 'mode' is 'MODEST'.
(Other definitions for modest that I've seen before include "Humble, not pretentious or showy" , "Mussorgsky, nominally?" , "Not having or showing pride" , "'Unassuming, diffident (6)'" , "Prudent" .)