Flavour of sweets originally found in art gallery (5)
I believe the answer is:
taste
'flavour' is the definition.
(I've seen this before)
'sweets originally found in art gallery' is the wordplay.
'originally' says to take the initial letters.
'found in' indicates putting letters inside.
'art gallery' becomes 'tate' (Tate Modern, Tate Britain etc).
The initial letter of 'sweets' is 's'.
's' placed inside 'tate' is 'TASTE'.
'of' is the link.
(Other definitions for taste that I've seen before include "Sample by eating or drinking a little" , "Appreciation, discernment" , "Sense showing refinement" , "Sample orally" , "Smack" .)