Vessel empty, intermittent rain plays a medley (3,6)

I believe the answer is:

pot pourri

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

(Other definitions for pot pourri that I've seen before include "Perfume" , "Aromatic mixture" , "Possible selection of literature" , "dried leaves" , "Literary arrangement" .)

I've seen this clue in The Hindu.

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