Second fall of water? European glacier could end with this (7)
I believe the answer is:
moraine
'glacier could end with this' is the definition.
The definition suggests a singular noun which matches the answer.
'second fall of water? european' is the wordplay.
I cannot really see how this works, but
'second' could be 'mo' (both are short periods of time) and 'mo' is present in the answer.
'fall' could be 'rain' (raining is a kind of falling) and 'rain' is present in the answer.
'european' could be 'e' (abbreviation e.g. EU) and 'e' is found in the answer.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for moraine that I've seen before include "Rocky ridge deposited by a glacier" , "Glacial deposit" , "glacier deposit" .)