Couple's woe ended too soon by Romeo (4)
I believe the answer is:
pair
'couple's' is the definition.
(synonyms)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for pair that I've seen before include "Duo" , "E.g. two aces; mate" , "Agreement to avoid division" , "flight of stairs" , "Put together - two of a kind" .)