What three-fifths of the water will make us? (3)
I believe the answer is:
wet
'what three-fifths' is the definition.
I can't tell whether this definition defines the answer.
'the water will make us?' is the wordplay.
I cannot really understand how this works, but
'the' could be 't' (the is pronounced as a 't' sound in some dialects) and 't' is found within the answer.
'us?' could be 'we' and 'we' is found in the answer.
No letters remain.
This explanation may well be incorrect...
'of' acts as a link.
Can you help me to learn more?
(Other definitions for wet that I've seen before include "Moisture; feeble (colloq.)" , "Watery" , "Soaked with liquid" , "Moistened" , "Soaked with water" .)