Crossword Genius

Spud for lawman? (6)

Ross

I believe the answer is:

murphy

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

This might be a double definition.

'spud' is the first definition.
(I know that spud can be written as murphy)

'lawman?' is the second definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'for' is the link.

Can you help me to learn more?

(Other definitions for murphy that I've seen before include "Irish potato" , "Lawmaker" , "lawgiver?" , "Spud?" , "King Edward, for example" .)

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