Crossword Genius

Furthermore, a cross word? (4)

Ross

I believe the answer is:

plus

I'm a little stuck... Click here to teach me more about this clue!

'furthermore' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for plus that I've seen before include "sign of more to come" , "being a little cross" , "Furthermore" , "Benefit" , "Something more" .)

I've seen this clue in the Evening Standard.
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