Sets bouquets without one (5)
I believe the answer is:
poses
'sets' is the definition.
(posing is a kind of setting)
'bouquets without one' is the wordplay.
'bouquets' becomes 'posies' ('posy' can be a synonym of 'bouquet').
'without' is a deletion indicator.
'one' becomes 'i' (Roman numeral).
'posies' with 'i' taken away is 'POSES'.
(Other definitions for poses that I've seen before include "Sits (for artists)" , "Sits for artist" , "Strikes attitude, maybe for photo" , "Posse (anag.)" , "is ready for photo" .)