Come in in pursuit of fish and chips (9)
I believe the answer is:
carpenter
'chips' is the definition.
(chips can informally refer to a carpenter)
'come in in pursuit of fish' is the wordplay.
'come in' becomes 'enter' ('enter' can be a synonym of 'come in').
'in pursuit of' says to put letters next to each other.
'fish' becomes 'carp' (carp is a kind of fish**).
'enter' put after 'carp' is 'CARPENTER'.
'and' acts as a link.
(Other definitions for carpenter that I've seen before include "Woodworker (Quince)" , "Chippy" , "chips?" , "job" , "tradesman" .)