Crossword Genius

Obsession of bird turning North to sleep soundly (5)

Ross

I believe the answer is:

craze

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'obsession' is the definition.
(thesaurus)

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

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(Other definitions for craze that I've seen before include "Fashion, fad; crack" , "Fine crack" , "passing fashion" , "passion" , "Widespread fad" .)

I've seen this clue in The Hindu.
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