Small cake or a little fish? (7)
I believe the answer is:
pikelet
'small cake' is the definition.
The definition suggests a singular noun which matches the answer.
'a little fish?' is the wordplay.
I cannot quite understand how this works, but
'little' could be 'l' (abbreviation for little) and 'l' is found within the answer.
'fish?' could be 'pike' (pike is a kind of fish) and 'pike' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
'or' is the link.
Can you help me to learn more?
(Other definitions for pikelet that I've seen before include "15 [TEACAKE]" , "afternoon treat, perhaps" , "local crumpet" , "Thin kind of crumpet" , "Type of crumpet" .)