Turn up with a band in high spirits (4-1-4)

I believe the answer is:

cock-a-hoop

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But I can't explain it at all! Could you help me understand?

(Other definitions for cock-a-hoop that I've seen before include "Thrilled to bits" , "Jubilant" , "Pleased and triumphant, like rooster with hula toy" , "Overjoyed" , "Feeling triumphant like male bird with toy" .)

I've seen this clue in The Times.

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