Come back with an answer (5)
I believe the answer is:
reply
I believe this clue is a double definition.
'come back' is the first definition.
(I've seen this before)
'an answer' is the second definition.
('reply' can be a synonym of 'answer')
'with' acts as a link.
(Other definitions for reply that I've seen before include "counterattack?" , "acknowledgement" , "Come back" , "Counter" , "Reciprocate" .)