Massachusetts cape (3)
I believe the answer is:
cod
'massachusetts cape' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for cod that I've seen before include "Payment arrangement" , "Large sea fish- it's a sham" , "Cash on delivery for hoax" , "Cash on delivery (abbr.)" , "to be paid for when it arrives" .)