Fan that is overwhelmed by royal submarine (7)
I believe the answer is:
grouper
'submarine' is the definition.
The answer and definition can be both things that one consumes for nourishment as well as being singular nouns.
Maybe you can see a link between them that I can't see?
'fan that is overwhelmed by royal' is the wordplay.
I cannot quite see how this works, but
'by' could be 'per' (I've seen this in another clue) and 'per' is found in the answer.
'royal' could be 'r' (abbreviation) and 'r' is found within the answer.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for grouper that I've seen before include "I order" , "that by implication isn't sole?" , "A fish" .)