Crossword Genius

A takeaway line (5)

Ross

I believe the answer is:

minus

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If this is the answer, I'm afraid I cannot explain it.

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(Other definitions for minus that I've seen before include "Reduced by the subtraction of - thus?" , "Negative arithmetic operation" , "Disadvantage" , "'Take away' sign" , "deficiency" .)

I've seen this clue in the Evening Standard.
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