Put down beneath fish and chippy (9)
I believe the answer is:
carpenter
'chippy' is the definition.
(informal term for a carpenter)
'put down beneath fish' is the wordplay.
'put down' becomes 'enter' (synonyms).
'beneath' says to put letters next to each other (in a down clue).
'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 "Joseph's occupation" , "artisan" , "Wood worker" , "Woodworker (Quince)" , "Chippy" .)