A takeaway sign (5)

I believe the answer is:

minus

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'sign' is the definition.
(I know that minus is a type of sign)

I can't explain the remainder of the clue.

(Other definitions for minus that I've seen before include "(Of temperature) below zero" , "Negative sign - negative thing" , "Disadvantage" , "Lacking; below zero" , "Lacking; negative" .)

I've seen this clue in the Evening Standard.

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