Crossword Genius

Island set, out to lunch on wine and fish (3,7)

Ross

I believe the answer is:

red mullets

I'm a little stuck... Click here to teach me more about this clue!

'fish' is the definition.
(I've seen this before)

'island set out to lunch on wine' is the wordplay.
I cannot quite see how this works, but
an anagram of 'set' is 'ets' which is present in the answer.
'on' could be 're' ('on' can be mean 'with reference to') and 're' is found in the answer.
'wine' could be 'm' (I have seen 'French wine ' mean 'm' so perhaps 'wine' could also mean 'm') and 'm' is located in the answer.
The remaining letters 'dull' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'and' acts as a link.

Can you help me to learn more?

(Another definition for red mullets that I've seen is " fish".)

I've seen this clue in The Sunday Times.
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