Crossword Genius

Tool does some calculations, we’re told (4)

Ross

I believe the answer is:

adze

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'tool' is the definition.
(adze is a kind of tool)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for adze that I've seen before include "Woodworker's tool" , "One might cut" , "Wood cutting tool" , "Carpenter's tool sounds mathematical" , "One cuts" .)

I've seen this clue in The Times.
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