Sort of joint cut at an angle (5)

I believe the answer is:

mitre

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'sort of joint' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for mitre that I've seen before include "A bishop wears it" , "symbol of ecclesiastical authority" , "in which one might find a bishop" , "Liturgical headdress" , "Kind of joint" .)

I've seen this clue in the Evening Standard.

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