Bishop's headdress (5)

I think it could be either:

nitre

mitre

'bishop's headdress' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for mitre that I've seen before include "One identifies bishop" , "Type of joint - bishop's hat" , "A bishop's tall hat" , "Bishop's cap - wood joint" , "Bishop's headwear" .)

I've seen this clue in The Independent, The Telegraph, the Evening Standard, The Times, the Sydney Morning Herald, The Mirror and The Guardian.

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