Crossword Genius

More cross (4)

Ross

I believe the answer is:

plus

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

This clue might be a double definition.

'more' is the first definition.
(I've seen this in another clue)

'cross' is the second definition.
The answer and definition can be both human attributes as well as being singular nouns.
Maybe they are linked in a way I don't understand?

Can you help me to learn more?

(Other definitions for plus that I've seen before include "Together with; advantage" , "credit" , "An advantage; positive" , "Something more" , "Positive sign" .)

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