Reasonable to get large gift (5)
I believe the answer is:
flair
'gift' is the definition.
(flair is a kind of gift)
'reasonable to get large' is the wordplay.
'reasonable' becomes 'fair' (associated in meaning).
'to get' indicates putting letters inside.
'large' becomes 'L' (eg in clothes sizes).
'fair' placed around 'l' is 'FLAIR'.
(Other definitions for flair that I've seen before include "Stylishness; talent" , "Elan; panache" , "Style, panache" , "Taste" , "Natural ability or elegance" .)