TV programme's new host stupidly invites man on oxygen (3,3,4)

'tv programme's' is the definition.
(BBC One television programme)

'new host stupidly invites man on oxygen' is the wordplay.
I cannot really see how this works, but
'new' could be 'n' and 'n' is located in the answer.
'man' could be 'theo' (I've seen this before) and 'theo' is found in the answer.
'on' could be 'o' (I've seen this in other clues) and 'o' is present in the answer.
This explanation may well be incorrect...