Crossword Genius

He's a bit of a libertine (4)

Ross

I believe the answer is:

bert

'he's' is the definition.

'a bit of a libertine' is the wordplay.
'a bit of' indicates a hidden word (I've seen 'a bit' mean this (the answer is formed by a bit of the clue)).
'BERT' is hidden within 'libertine'.

I've seen this clue in the Evening Standard.
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