Crossword Genius

Bishop's headdress (5)

Ross

I think it could be either:

nitre

mitre

(Other definitions for nitre that I've seen before include "explosive producer?" , "Salt" , "A part of fertilizer" , "fertiliser" , "Otherwise saltpetre" .)

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