Finish in sweet surrender (3)
I believe the answer is:
end
'finish' is the definition.
(synonyms)
'in sweet surrender' is the wordplay.
'in' says the answer is hidden in the clue.
'END' is hidden within 'sweet surrender'.
(Other definitions for end that I've seen before include "Butt" , "Culmination" , "Termination" , "Finish; goal" , "Terminate in den" .)