Show fatigue (3)

I think it could be either:

Which length description are you looking for?:

yawn

'show fatigue' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for yawn that I've seen before include "Show boredom" , "Show one is tired or bored" , "Sleepy gape" , "Expression of tiredness" , "Intake of breath through a wide-open mouth" .)

I've seen this clue in the Penny Press.

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