Fish from lake carried in straw hat (7)
I believe the answer is:
bloater
'fish' is the definition.
(bloater is a kind of fish)
'lake carried in straw hat' is the wordplay.
'lake' becomes 'L' (geographical abbreviation).
'carried in' indicates putting letters inside.
'straw hat' becomes 'boater' (synonyms).
'l' placed within 'boater' is 'BLOATER'.
'from' is the link.
(Other definitions for bloater that I've seen before include "Herring salted and smoked" , "Buckling" , "that will more than fill one up" , "food" , "Cured herring" .)