Extra cross (4)

I believe the answer is:

plus

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

This might be a double definition.

'extra' is the first definition.
(plus can mean more than expected)

'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 "Something more" , "Together with; advantage" , "And also; a bonus" , "Furthermore" , "Positive sign" .)

I've seen this clue in the Evening Standard.

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