Tell about an idiot giving cheek (7)

I believe the answer is:

sassing

'cheek' is the definition.
(sassing is a kind of cheek)

'tell about an idiot' is the wordplay.
'tell' becomes 'sing' (I've seen this in other clues).
'about' means one lot of letters goes inside another.
'an idiot' becomes 'ass' (both can mean a stupid person).
'sing' placed around 'ass' is 'SASSING'.

'giving' is the link.

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

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