Mischievously playful nobleman encountered one of the Habsburgs (8)

I believe the answer is:

archduke

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'encountered one of the habsburgs' is the definition.
I can't tell whether this definition defines the answer.

'mischievously playful nobleman' is the wordplay.
'mischievously playful' becomes 'arch' (I've seen this before. I am not sure about the 'mischievously' bit.).
'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 "Title of Franz Ferdinand, shot in Sarajevo in 1914" , "Prince of the former ruling house of Austria, Ferdinand for one" , "European noble" , "noted trio" , "European nobleman" .)

I've seen this clue in The Irish Times.

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