Mostly sea food that's spicy (5)
I believe the answer is:
balti
'food that's spicy' is the definition.
I know nothing about this answer so I can't tell whether it can be defined by this definition.
'mostly sea' is the wordplay.
'mostly' means to remove the last letter.
'sea' becomes 'Baltic' (Baltic is an example).
'baltic' with its last letter taken off is 'BALTI'.
Can you help me to learn more?
(Other definitions for balti that I've seen before include "Curry dish cooked and served in a flat-bottomed pot" , "Type of Pakistani cuisine" , "food from India?" , "Style of curry" , "Asian food" .)