Turbulent river rose creating large body of water (9)
I believe the answer is:
reservoir
'body of water' is the definition.
(reservoir is a kind of body of water)
'turbulent river rose' is the wordplay.
'turbulent' indicates anagramming the letters.
'river'+'rose'='riverrose'
'riverrose' is an anagram of 'RESERVOIR'.
'creating large' is the link.
This may not be correct. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for reservoir that I've seen before include "Store for water etc" , "Man-made lake or tank" , "Area for storage, of water say" , "Lake for collecting and storing water" , "Area flooded" .)