Man-made lake's river rose disastrously (9)
I believe the answer is:
reservoir
'man-made lake's' is the definition.
'reservoir' can be an answer for 'lake's' (reservoir is a kind of lake). I am not sure about the 'man-made' bit.
'river rose disastrously' is the wordplay.
'disastrously' indicates anagramming the letters (I've seen this in other clues).
'river'+'rose'='riverrose'
'riverrose' with letters rearranged gives 'RESERVOIR'.
Can you help me to learn more?
(Other definitions for reservoir that I've seen before include "Source of water supply" , "Lake for collecting and storing water" , "Lake used to store water for community use" , "Lake created to store water" , "Man-made lake to store water" .)