Got to pop by the pier for some fish (7)
I believe the answer is:
haddock
'some fish' is the definition.
(haddock is a kind of fish)
'got to pop by the pier' is the wordplay.
'got' becomes 'had' (having is a kind of getting).
'to pop by the pier' becomes 'dock'.
'had'+'dock'='HADDOCK'
'for' is the link.
(Other definitions for haddock that I've seen before include "Swimmer" , "White fish" , "Edible fish like small cod" , "Fish similar to but smaller than cod" , "Popular food fish" .)