Union matching deal (9)
I believe the answer is:
agreement
This clue might be a double definition.
'union' is the first definition.
(I've seen this before)
'matching deal' is the second definition.
'agreement' can be an answer for 'deal' (I've seen this before). I'm unsure of the 'matching' bit.
Can you help me to learn more?
(Other definitions for agreement that I've seen before include "Contract or promise" , "Accord, contract" , "match" , "understanding" , "legal contract maybe" .)