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Gladiator ordered to cast off gold headgear (5)

Ross

I believe the answer is:

tiara

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'headgear' is the definition.
(tiara is a kind of headgear)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for tiara that I've seen before include "Half a crown!" , "Jewelled headpiece" , "Jewelled head-ornament" , "It might go to one's head" , "Jewelled head ornament" .)

I've seen this clue in The Telegraph.
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