Sweets given back under pressure (8)
I believe the answer is:
stressed
'under pressure' is the definition.
(I've seen this before)
'sweets given back' is the wordplay.
'sweets' becomes 'desserts' ('dessert' can be a synonym of 'sweet').
'given back' says the letters should be written backwards.
'desserts' in reverse letter order is 'STRESSED'.
(Other definitions for stressed that I've seen before include "Emphasized or strained" , "on edge" , "Brought out" , "Emphasized or attached importance to" , "Suffering mental strain" .)