Crossword Genius

Me about to restrain a drunken Lord Onslow? (7)

Ross

I believe the answer is:

earldom

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

'onslow?' is the definition.
I can't tell whether this definition defines the answer.

'me about to restrain a drunken lord' is the wordplay.
'about' is an anagram indicator.
'to restrain' indicates putting letters inside.
'drunken' is an anagram indicator.
'me' with letters rearranged gives 'em'.
'lord' is an anagram of 'rldo'.
'a'+'rldo'='arldo'
'em' placed around 'arldo' is 'EARLDOM'.

Can you help me to learn more?

(Other definitions for earldom that I've seen before include "Peer's domain" , "Norfolk or Wessex, for example" , "What sort of noble has" , "Noble's status" , "noble area of country" .)

I've seen this clue in The Independent.
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