Chartered accountant expresses disapproval in collusion (7)

I believe the answer is:

cahoots

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'collusion' is the definition.
(to be 'in cahoots' is to collude with someone)

'chartered accountant expresses disapproval' is the wordplay.
'chartered accountant' becomes 'CA' (abbreviation for chartered accountant).
'expresses disapproval' becomes 'hoots' (I am not sure about this - if you are sure you should believe this answer much more).
'ca'+'hoots'='CAHOOTS'

'in' is the link.

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(Other definitions for cahoots that I've seen before include "League" , "In - means colluding" , "Collusion" , "In such agreement" , "(In) conspiracy" .)

I've seen this clue in the Sydney Morning Herald.

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