Canoe unsuitable for so much water (5)
I believe the answer is:
ocean
'so much water' is the definition.
'ocean' can be an answer for 'water' (oceans are bodies of water). I'm not sure about the 'so much' bit.
'canoe unsuitable' is the wordplay.
'unsuitable' indicates an anagram (letters not in suitable order).
'canoe' anagrammed gives 'OCEAN'.
'for' is the link.
Can you help me to learn more?
(Other definitions for ocean that I've seen before include "Very large area of sea" , "eg Indian, Atlantic" , "A lot of water!" , "Indian, for example" , "Large body of salt water" .)