Crossword Genius

Thinks it’s a calculator (7)

Ross

I believe the answer is:

reckons

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'thinks' is the definition.
(reckoning is a kind of thinking)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for reckons that I've seen before include "Considers" , "Calculates" , "Suspects" , "Estimates" , "Conkers (anag.)" .)

I've seen this clue in the Evening Standard.
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