Disturb soldier in a gallery (7)
I believe the answer is:
agitate
'disturb' is the definition.
(I've seen this before)
'soldier in a gallery' is the wordplay.
'soldier' becomes 'gi' (government issue or general issue).
'in' indicates putting letters inside.
'gallery' becomes 'tate' (I've seen this before).
'a'+'tate'='atate'
'gi' inserted inside 'atate' is 'AGITATE'.
(Other definitions for agitate that I've seen before include "Incite" , "'Stir, excite (7)'" , "Disturb or stir up" , "Make troubled or nervous" , "Upset, disturb the surface of" .)