Rise and go out for fish (7)
I believe the answer is:
sardine
'for fish' is the definition.
(sardine is a type of fish)
'rise and go out' is the wordplay.
'go out' indicates anagramming the letters.
'rise'+'and'='riseand'
'riseand' with letters rearranged gives 'SARDINE'.
(Other definitions for sardine that I've seen before include "FRENCH FISH" , "Small fish, usually canned" , "(Cramped?) fish" , "Fish in tin?" , "Stonefish OR? Stone" .)