What could be nature's providers of refreshment (3,4)
I believe the answer is:
tea urns
'providers of refreshment' is the definition.
I don't know anything about this answer so I can't tell whether this works.
'what could be nature's' is the wordplay.
'what could be' indicates anagramming the letters.
'natures' with letters rearranged gives 'TEA-URNS'.
Can you help me to learn more?
(Other definitions for tea urns that I've seen before include "refreshments they provide" , "containers" .)