Crossword Genius

Sort of prisoner left us: may travel for safety abroad (9,6)

Ross

I believe the answer is:

political asylum

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

'travel for safety abroad' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'sort of prisoner left us' is the wordplay.
'sort of prisoner' becomes 'political'.
'left us' becomes 'asylum' (I can't explain this - if you can you should believe this answer much more).
'political'+'asylum'='POLITICAL ASYLUM'

'may' is the link.

Can you help me to learn more?

(Other definitions for political asylum that I've seen before include "refuge?" , "State protection" .)

I've seen this clue in The Guardian.
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