No fellow for mixing? (4,4)

I believe the answer is:

lone wolf

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'mixing?' is the definition.
Both the definition and answer are singular nouns.
Maybe they are linked in a way I don't understand?

'no fellow' is the wordplay.
'no fellow' anagrams to 'LONE WOLF'.
However, I'm not sure how this is indicated.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for lone wolf that I've seen before include "independent type" , "Solitary type" , "Independent operator" , "Person who prefers solitude" , "recluse" .)

I've seen this clue in The Sun.

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