Crossword Genius

Noble Scot's computer not working (7)

Ross

I believe the answer is:

macduff

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'noble scot's' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'computer not working' is the wordplay.
'computer' becomes 'Mac' (Apple Mac computer).
'not working' becomes 'duff' (duff can mean defective).
'mac'+'duff'='MACDUFF'

Can you help me to learn more?

(Other definitions for macduff that I've seen before include "He was invited to lay on" , "Slayer of 13" , "Murderer of Macbeth" , "One told to lay on" , "Shakespearean character" .)

I've seen this clue in The Times.
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