Crossword Genius

Showed signs of fatigue (6)

Ross

I believe the answer is:

yawned

(Other definitions for yawned that I've seen before include "Demonstrated tiredness (or boredom!)" , "Gaped, with tiredness?" , "Gave visible sign of boredom - or tiredness" , "Gave mute oral sign of boredom" , "Showed tiredness or tedium" .)

I've seen this clue in the Evening Standard.
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