Some who spill the beans on joint position at bank (10)

I believe the answer is:

tellership

'position at bank' is the definition.
(position or duties of a bank teller)

'some who spill the beans on joint' is the wordplay.
'some who spill the beans' becomes 'tellers' (to spill the beans is to tell a secret).
'on' means one lot of letters go next to another.
'joint' becomes 'hip joint' (hip is a kind of joint).
'tellers'+'hip'='TELLERSHIP'

(Another definition for tellership that I've seen is " position in bank".)

I've seen this clue in The Times.

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