You could aptly sip Champagne while soaking in it (6,4)

I believe the answer is:

bubble bath

(Other definitions for bubble bath that I've seen before include "agent foaming" , "Foam-producing substance" , "It adds foam and scent to water" , "Relaxing soapy additive to water" , "Lathering agent for ablutions" .)

I've seen this clue in the Universal.

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