Crossword Genius

Something to cut out (6)

Ross

I believe the answer is:

coupon

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'cut out' is the definition.
The definition and answer can be both related to thinking as well as being singular nouns.
Perhaps they are linked in a way I don't understand?

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for coupon that I've seen before include "Voucher or ticket" , "betting slip" , "means to buy goods" , "Entry form" , "Token" .)

I've seen this clue in the Evening Standard.
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