Be all square in match (3)
I believe the answer is:
tie
I believe this clue is a double definition.
'be all square' is the first definition.
'match' is the second definition.
(thesaurus)
'in' acts as a link.
(Other definitions for tie that I've seen before include "Neck attire" , "Knot; achieve the same score" , "may make one hot under the collar" , "Bond; draw" , "Fasten, link to" .)