Crossword Genius

Murphy, maybe? (5)

Ross

I believe the answer is:

tuber

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'murphy' is the definition.
Although both the answer and definition are singular nouns, I cannot see how they can define each other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for tuber that I've seen before include "Thickened fleshy root" , "A potato, for instance" , "Brute (anag)" , "Root of potato etc" , "Root eg of potato" .)

I've seen this clue in the Evening Standard.
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