Left wearing reasonable gift (5)
I believe the answer is:
flair
'gift' is the definition.
(I know that flair is a type of gift)
'left wearing reasonable' is the wordplay.
'left' becomes 'l' (common abbreviation).
'wearing' indicates putting letters inside.
'reasonable' becomes 'fair' (synonyms).
'l' going inside 'fair' is 'FLAIR'.
(Other definitions for flair that I've seen before include "Style, talent" , "Elan; panache" , "Natural ability/talent" , "Style, panache" , "Faculty" .)