Fish stew appearing inferior to Brit (7)
I believe the answer is:
pomfret
'fish' is the definition.
(pomfret is a kind of fish)
'stew appearing inferior to brit' is the wordplay.
'stew appearing' becomes 'fret' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'inferior to' is a charade indicator (letters next to each other) (in a down clue, some letters go below others).
'brit' becomes 'pom' (pom is a kind of brit).
'fret' after 'pom' is 'POMFRET'.
Can you help me to learn more?
(Other definitions for pomfret that I've seen before include "sort of cake" , "cake, Yorkshire style" , "Round flat liquorice sweet - Asian food fish" .)