One joins a rogue for something to eat (6)
I believe the answer is:
scampi
'something to eat' is the definition.
(scampi is a kind of food)
'one joins a rogue' is the wordplay.
'one' becomes 'i' (Roman numeral).
'joins' is a charade indicator (letters next to each other).
'a rogue' becomes 'scamp' (I've seen this before).
'i' put after 'scamp' is 'SCAMPI'.
'for' is the link.
(Other definitions for scampi that I've seen before include "Dish of fried shrimps or prawns" , "Large prawns cooked in batter" , "Dish of deep-friend prawns" , "Prawn dish" , "Dish of cooked shrimps or prawns" .)