Crossword Genius

Jeff's canine companion? (4)


I believe the answer is:


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This might be a double definition.

'jeff's' is the first definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I don't see?

'canine companion?' is the second definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.

Can you help me to learn more?

(Other definitions for mutt that I've seen before include "Mongrel - fool" , "Mongrel dog - foolish person" , "Dog of mixed breed" , "Chump" , "Thematic type [DOG]" .)

I've seen this clue in the Evening Standard.
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