Crossword Genius

Attempted promoting one, feeling exhausted (5)

Ross

I believe the answer is:

tired

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'exhausted' is the definition.
(exhausted can mean very tired)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tired that I've seen before include "Physically or mental weary" , "Dressed once" , "Are American cars so" , "getting bored" , "Zonked" .)

I've seen this clue in The Telegraph.
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