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Stunned nobleman finds no-one home! (3,3,3,5)

Ross

I believe the answer is:

out for the count

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

'home' is the definition.
Both the definition and answer are adjectives.
Maybe they are linked in a way I don't understand?

'stunned nobleman finds no-one' is the wordplay.
I cannot quite understand how this works, but
'stunned' could be 'out' (synonyms) and 'out' is located in the answer.
'nobleman' could be 'count' (count is a kind of nobleman) and 'count' is located in the answer.
'no' could be 'o' (O resembles 0) and 'o' is located in the answer.
'one' could be 'the' (both can introduce a definite example of something) and 'the' is located in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for out for the count that I've seen before include "KO'd" , "Flat" , "on canvas?" , "like van Helsing?" , "Sound asleep" .)

I've seen this clue in the Sydney Morning Herald.
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