Roguish nobleman? (8)

I believe the answer is:

archduke

I'm a little stuck... Click here to teach me more about this clue!

'roguish nobleman?' is the definition.
'archduke' can be an answer for 'nobleman?' (I have seen 'Top nobleman' mean 'archduke' so perhaps 'nobleman' could also mean 'archduke'). I'm not sure about the 'roguish' bit.

'roguish nobleman?' is the wordplay.
'roguish' becomes 'arch' (I've seen this before).
'nobleman?' becomes 'duke' (duke is a kind of nobleman).
'arch'+'duke'='ARCHDUKE'

Can you help me to learn more?

(Other definitions for archduke that I've seen before include "European nobleman" , "Top nobleman" , "Austrian noble" , "European noble" , "Emperor's son" .)

I've seen this clue in the Evening Standard.

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