Crossword Genius

One's beaten by hostile tribe (7)

Ross

I think it could be either:

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7

3,4

wardrum

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'tribe' is the definition.
I don't know anything about this answer so I can't tell whether this works.

'one's beaten by hostile' is the wordplay.
'one's beaten' becomes 'drum' (you beat a drum to play it).
'by' says to put letters next to each other.
'hostile' becomes 'war' (I can't explain this - if you can you should give a lot more credence to this answer).
'drum' put after 'war' is 'WARDRUM'.

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I've seen this clue in The Guardian.
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