Transform a wet river and its contents (5)
I believe the answer is:
water
'its contents' is the definition.
I can't judge whether this definition defines the answer.
'transform a wet river' is the wordplay.
'transform' indicates an anagram.
'river' becomes 'r' (abbreviation for river).
'a'+'wet'='awet'
'awet' anagrammed gives 'wate'.
'wate'+'r'='WATER'
'and' is the link.
Can you help me to learn more?
(Other definitions for water that I've seen before include "Common fluid" , "Commonplace drink" , "What makes the Somme" , "Adam's ale" , "What can produce solution" .)