... and grins, tantalised about flash! (7)
I believe the answer is:
instant
'flash' is the definition.
(I know that flash can be written as instant)
'and grins tantalised about' is the wordplay.
'about' says the answer is hidden in the clue (the clue goes around or about the answer).
'INSTANT' is hidden within 'and grins tantalised'.
(Other definitions for instant that I've seen before include "No need to cook" , "Occurring with no delay" , "Short time, of the current month" , "Split second" , "This coffee is made from powder" .)