Crossword Genius

Single paw used to fight with (6)

Ross

I believe the answer is:

weapon

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

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for weapon that I've seen before include "Means of fighting" , "Implement to injure or kill" , "Instrument of war" , "Thing used to hurt, like gun, knife, bomb etc" , "club, perhaps" .)

I've seen this clue in The Irish Times.
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