Cured fish left in straw hat (7)
I believe the answer is:
bloater
'cured fish' is the definition.
'bloater' can be an answer for 'fish' (bloater is a kind of fish). I'm unsure of the 'cured' bit.
'left in straw hat' is the wordplay.
'left' becomes 'l' (common abbreviation).
'in' indicates putting letters inside.
'straw hat' becomes 'boater' (synonyms).
'l' inserted within 'boater' is 'BLOATER'.
Can you help me to learn more?
(Other definitions for bloater that I've seen before include "Cured herring" , "Buckling" , "Something fishy" , "Fish" , "Herring salted and smoked" .)