He's a bit of a problem (3)

I believe the answer is:

rob

'he's' is the definition.

'a bit of a problem' is the wordplay.
'a bit of' says the answer is hidden in the clue.
'ROB' is hidden within 'problem'.

(Other definitions for rob that I've seen before include "Take without consent from the owner" , "boy's name" , "Steal or purloin" , "Thieve" , "Steal violently" .)

I've seen this clue in the Evening Standard.

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