Joint headgear (5)

I believe the answer is:

mitre

I believe this is a double definition.

'joint' is the first definition.
(I know that mitre is a type of joint)

'headgear' is the second definition.
(I know that mitre is a type of headgear)

(Other definitions for mitre that I've seen before include "Corner joint - bishop's headdress" , "Timer (anag.)" , "Item of headgear" , "episcopal head may come under this" , "symbol of ecclesiastical authority" .)

I've seen this clue in The Globe and Mail.

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