Down pop with son drinking last of Coke (8)

I believe the answer is:

feathers

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'down' is the definition.
(down can mean bird feathers)

I don't understand the rest of the clue.

(Other definitions for feathers that I've seen before include "Aids to flight" , "Possibly down" , "Bird insulation" , "''Hope is the thing with ...'' (Emily Dickinson)" , "Plumage, insulation for birds" .)

I've seen this clue in The Guardian.

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