Help to oversee French swine, not on air (2-5)

I believe the answer is:

co-chair

'help to oversee' is the definition.
(help the chairman oversee committee say)

'french swine not on air' is the wordplay.
'french swine' becomes 'cochon' (French for 'swine').
'not' suggests deleting specific letters.
'cochon' with 'on' taken away is 'coch'.
'coch'+'air'='CO-CHAIR'

I've seen this clue in The Everyman puzzle in The Observer.

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