Go with extra pie (8)
I believe the answer is:
turnover
'pie' is the definition.
(thesaurus)
'go with extra' is the wordplay.
'go' becomes 'turn' ('turn' can be a synonym of 'go'**).
'with' means one lot of letters go next to another.
'extra' becomes 'over'.
'turn'+'over'='TURNOVER'
(Other definitions for turnover that I've seen before include "(Annual) money taken by business; small pie" , "The amount of money taken by a business in a particular period" , "volume of business" , "sales of > pastry?" , "Folded pie" .)