Go across for something to eat (8)
I believe the answer is:
turnover
'something to eat' is the definition.
(turnover is a kind of food)
'go across' is the wordplay.
'go' becomes 'turn' ('turn' can be a synonym of 'go'**).
'across' becomes 'over' ('over' can be a synonym of 'across').
'turn'+'over'='TURNOVER'
'for' acts as a link.
(Other definitions for turnover that I've seen before include "Gross value of sales" , "Total value of sales" , "Business - reversal" , "patisserie product" , "Business done" .)