Flash gift, by the sound of it? (5)
I believe the answer is:
flare
'flash' is the definition.
(I know that flash can be written as flare)
'gift by the sound of it?' is the wordplay.
'gift' becomes 'flair' (flair is a kind of gift).
'by the sound of it?' shows a homophone (sound like).
'flair' sounds like 'FLARE'.
(Other definitions for flare that I've seen before include "Burn with sudden brightness" , "(Burn with) sudden blaze" , "Blaze in feral manner" , "Widen out like a bell" , "Feral kind of sudden activity" .)