Crossword Genius

Part of joint treasurer's brief (5)

Ross

I believe the answer is:

bursa

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'part of joint' is the definition.
'bursa' can be an answer for 'part' (bursa is a kind of part). I am not certain of the 'of joint' bit.

'treasurer's brief' is the wordplay.
'treasurer' becomes 'bursar' (someone in charge of money).
'brief' means to remove the last letter (a shorter or briefer version of the word).
'bursar' with its last letter removed is 'BURSA'.

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I've seen this clue in The Guardian.
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