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Zulu loses head in war dance (4)

Ross

I believe the answer is:

haka

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'dance' is the definition.
(I've seen this before)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for haka that I've seen before include "Aggressive Kiwi dance before a rugby match" , "routine before start of match" , "Maori ceremonial war dance" , "Maori ceremonial war-dance" , "pre-match ritual" .)

I've seen this clue in The Independent.
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