Cod main cooked for itinerant (7)
I believe the answer is:
nomadic
'for itinerant' is the definition.
(I've seen this before)
'cod main cooked' is the wordplay.
'cooked' is an anagram indicator (letters cooked into a new form).
'cod'+'main'='codmain'
'codmain' anagrammed gives 'NOMADIC'.
(Other definitions for nomadic that I've seen before include "Wandering from place to place, with no permanent home" , "Peripatetic" , "vagrant" , "Moving around" , "Migratory" .)