Staggers seeing decoys outside church (7)
I believe the answer is:
lurches
'staggers' is the definition.
(stagger can mean to sway or lurch around)
'decoys outside church' is the wordplay.
'decoys' becomes 'lures' ('lure' can be a synonym of 'decoy').
'outside' means one lot of letters goes inside another.
'church' becomes 'ch' (common abbreviation).
'lures' going around 'ch' is 'LURCHES'.
'seeing' acts as a link.
(Other definitions for lurches that I've seen before include "|Moves with an unsteady uneven gait" , "Walks with unsteady swaying motion" , "Moves in unsteady swaying way, staggers" .)