Crossword Genius

Foreign national cross with lumpy pate around (2-3)

Ross

I believe the answer is:

ex-pat

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

'foreign national' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'cross with lumpy pate around' is the wordplay.
I cannot really understand how this works, but
'cross' could be 'x' (X is cross-shaped) and 'x' is present in the answer.
an anagram of 'pate' is 'epat' which is located in the left over letters.
No letters remain.
This explanation may well be incorrect...

Can you help me to learn more?

(Another definition for ex-pat that I've seen is " Person living abroad".)

I've seen this clue in The Mirror.
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