In both emotions? Not us (4)
I believe the answer is:
them
'not us' is the definition.
(I've seen this in another clue)
'in both emotions?' is the wordplay.
'in' indicates a hidden word.
'THEM' can be found hidden inside 'both emotions'.
(Other definitions for them that I've seen before include "Let -- eat cake" , "people objectively" , "Certainly not us, the other lot" , "Those people (as object)" , "(To/from) those people" .)