Soap bubbles (4)
I believe the answer is:
suds
'soap bubbles' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for suds that I've seen before include "Froth made from soap" , "Lathery bubbles" , "Foam from detergent" , "Lather" , "Soapy froth" .)