Leave union attorney some cheese (5)
I believe the answer is:
gouda
'some cheese' is the definition.
(Gouda cheese is an example)
'leave union attorney' is the wordplay.
'leave' becomes 'go' (to go is to depart or leave).
'union' becomes 'U' (common abbreviation as in Trades Union Congress).
'attorney' becomes 'DA' (abbreviation for District Attorney).
'go'+'u'+'da'='GOUDA'
(Other definitions for gouda that I've seen before include "It comes from Holland" , "type of cheese" , "Dutch town" , "Dutch 4 across" , "Round Dutch cheese" .)