Yankee with rod set up for fish (4)
I believe the answer is:
dory
'fish' is the definition.
(dory is a kind of fish)
'yankee with rod set up' is the wordplay.
'yankee' becomes 'Y' (phonetic alphabet: alpha, bravo, charlie etc.).
'with' says to put letters next to each other.
'set up' says the letters should be written in reverse.
'rod' back-to-front is 'dor'.
'y' put after 'dor' is 'DORY'.
'for' is the link.
(Other definitions for dory that I've seen before include "Sea-wolf" , "Marine fish; rowing boat" , "Fish of mackerel family" , "Fish and flat-bottomed boat" , "Golden-yellow fish" .)