Crossword Genius

One's beaten by hostile tribe (3,4)

Ross

I think it could be either:

Which length description are you looking for?:

7

3,4

war drum

'tribe' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'one's beaten by hostile' is the wordplay.
'one's beaten' becomes 'drum' (you beat a drum to play it).
'by' is a charade indicator (letters next to each other).
'hostile' becomes 'war' (I can't justify this - if you can you should believe this answer much more).
'drum' after 'war' is 'WAR-DRUM'.

(Other definitions for war drum that I've seen before include "threat of hostilities" , "beaten in battle?" .)

I've seen this clue in The Guardian.
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