Crossword Genius

Losing first halves on return, Sweden and Norway displayed fatigue (6)

Ross

I believe the answer is:

yawned

'displayed fatigue' is the definition.
(yawning indicates tiredness)

I don't understand the rest of the clue.

(Other definitions for yawned that I've seen before include "Breathed deeply with mouth wide open" , "Opened mouth wide as expression of boredom" , "Demonstrated tiredness (or boredom!)" , "Showed tiredness or tedium" , "Gave visible sign of boredom - or tiredness" .)

I've seen this clue in The Independent.
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