Marine creature ditching lake — for this? (3)
I believe the answer is:
sea
This could be a double definition.
'marine' is the first definition.
(both can mean 'of the sea')
'creature ditching lake for this?' is the second definition.
The definition suggests a singular noun which matches the answer.
Can you help me to learn more?
(Other definitions for sea that I've seen before include "Large body of salt water" , "E.g. Yellow, Red area" , "Large expanse of water" , "& 14 Ozone" , "E.g. Baltic" .)