Seafood a bishop has all by himself (7)
I believe the answer is:
abalone
'seafood' is the definition.
(type of sea snail)
'a bishop has all by himself' is the wordplay.
'a bishop' becomes 'B' (abbreviation for bishop in chess).
'has' means one lot of letters go next to another.
'all' becomes 'a' (I am not sure about this - if you are sure you should believe this answer much more).
'by himself' becomes 'alone'.
'b' put after 'a' is 'ab'.
'ab'+'alone'='ABALONE'
Can you help me to learn more?
(Other definitions for abalone that I've seen before include "shellfish for instance" , "Edible marine mollusc -- Oban ale (anag)" , "Mother-of-pearl could have come from" , "Seafood" , "Mollusc also called ormer" .)