Do they have high bills? Energy comes down with provider finally making cut (6)
I believe the answer is:
egrets
'do they' is the definition.
The definition suggests a plural noun which matches the answer.
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for egrets that I've seen before include "creatures" , "Greets like fishing eagles" , "waders" , "Kind of herons with long white feathers" , "Greets in way of certain herons (" .)