Garland’s free time? Not sure (3)
I believe the answer is:
lei
'garland's' is the definition.
('lei' can be a synonym of 'garland')
'free time? not sure' is the wordplay.
'free time?' becomes 'leisure' (free time is a kind of leisure).
'not' suggests deleting specific letters.
'leisure' with 'sure' taken away is 'LEI'.
(Other definitions for lei that I've seen before include "Polynesian garland of flowers" , "neck decoration" , "Honolulu chain of flowers" , "Band of flowers" , "Floral decoration" .)