Reserve enclosure, after a fashion (7)
I believe the answer is:
modesty
'reserve' is the definition.
('modesty' can be a synonym of 'reserve')
'enclosure after a fashion' is the wordplay.
'enclosure' becomes 'sty' (sty is a kind of enclosure).
'after' is a charade indicator (letters next to each other).
'a fashion' becomes 'mode' ('mode' can be a synonym of 'fashion'**).
'sty' put after 'mode' is 'MODESTY'.
(Other definitions for modesty that I've seen before include "Freedom from vanity" , "Way to get disorderly house under" , "Reserve" , "Unassuming quality" , "lack of vanity" .)