Crossword Genius

Sign for something extra (4)

Ross

I believe the answer is:

plus

I believe this clue is a double definition.

'sign' is the first definition.
(plus sign is a kind of sign)

'something extra' is the second definition.
(I've seen this in another clue)

'for' acts as a link.

(Other definitions for plus that I've seen before include "Positive and not a negative" , "Advantage; also" , "sign of the cross" , "An advantage; positive" , "mark for arithmetic" .)

I've seen this clue in The Globe and Mail.
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