Joint party-giver’s charge for keeping house (6)

I believe the answer is:

cohost

'joint party-giver's' is the definition.
(person hosting a party with another person)

'charge for keeping house' is the wordplay.
'charge' becomes 'cost' (I've seen this before).
'for keeping' indicates putting letters inside.
'house' becomes 'ho' (abbreviation for house).
'cost' placed around 'ho' is 'COHOST'.

(Another definition for cohost that I've seen is " Joint party giver".)

I've seen this clue in The Times.

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