Mao and Stalin worked out an end to Channel crossings (5-4)

I believe the answer is:

saint-malo

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'an end to channel crossings' is the definition.
I know nothing about this answer so I can't judge whether it can be defined by this definition.

'mao and stalin worked' is the wordplay.
'and' is a charade indicator (letters next to each other).
'worked' indicates an anagram.
'mao' after 'stalin' is 'stalinmao'.
'stalinmao' with letters rearranged gives 'SAINT-MALO'.

'out' acts as a link.

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