Crossword Genius

With the addition of (4)

Ross

I believe the answer is:

plus

'with the addition of' is the definition.
(I've seen this before)

This is the entire clue.

(Other definitions for plus that I've seen before include "being a little cross" , "sign of the cross" , "Positive quality" , "Advantage; also" , "Added extra" .)

I've seen this clue in The Telegraph, The Times, The Irish Times and the Sydney Morning Herald.
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