Crossword Genius

Incisive associate of Jack and Mack (5)

Ross

I believe the answer is:

knife

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

This clue could be a double definition.

'incisive associate of jack' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'mack' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?

'and' acts as a link.

Can you help me to learn more?

(Other definitions for knife that I've seen before include "Cutting tool" , "Potential weapon" , "Cutting implement - stab" , "Lethal weapon" , "Use this to carve" .)

I've seen this clue in the Evening Standard.
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