Bring back checks in front of gallery (9)
I believe the answer is:
reinstate
'bring back' is the definition.
(I've seen this before)
'checks in front of gallery' is the wordplay.
'checks' becomes 'reins' (reining is a kind of checking).
'in front of' means one lot of letters go next to another (some letters go in front of others).
'gallery' becomes 'tate' (Tate Modern, Tate Britain etc).
'reins'+'tate'='REINSTATE'
(Other definitions for reinstate that I've seen before include "Restore, put back" , "Restore to a former condition" , "Bring back" , "Restore to previous position" , "Give back" .)