It's not left to Jack-of-all-trades with no yard by Friday, for example? (5-4,3)

I believe the answer is:

right-hand man

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But I can't explain it at all! Could you help me understand?

(Other definitions for right-hand man that I've seen before include "Most trusted assistant" , "Reliable assistant" , "Important assistant" , "Chief assistant; major domo" , "One's most valuable assistant" .)

I've seen this clue in The Irish Times.

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