Wealth check signifies big game (5,4)
I believe the answer is:
means test
'wealth check' is the definition.
'signifies big game' is the wordplay.
'signifies' becomes 'means' ('mean' can be a synonym of 'signify').
'big game' becomes 'test' (I've seen this before).
'means'+'test'='MEANS TEST'
(Other definitions for means test that I've seen before include "financial investigation" , "it may lead to a benefit" , "Check to see if one qualifies for assistance" , "enquiry into funding" , "Inquiry into the financial state of a person applying for aid" .)