Retort from disheartened wife in new snack bar (6,4)
I believe the answer is:
answer back
'retort' is the definition.
('answer back' can be a synonym of 'retort')
'disheartened wife in new snack bar' is the wordplay.
'disheartened' says to hollow out the word (remove centre letters).
'in' means one lot of letters goes inside another.
'new' indicates an anagram.
'wife' with its middle taken out is 'we'.
'snack'+'bar'='snackbar'
'snackbar' anagrammed gives 'ansrback'.
'we' inserted inside 'ansrback' is 'ANSWER BACK'.
'from' acts as a link.
(Other definitions for answer back that I've seen before include "reply impertinently" , "Reply pertly" , "Retort" , "Be impertinent" .)