Waterfalls affecting the eyes? (9)
I believe the answer is:
cataracts
'waterfalls' is the definition.
('cataract' can be a synonym of 'waterfall')
'affecting the eyes?' is the wordplay.
I cannot quite see 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.
'eyes?' could be 'acts' (eye is a kind of act) and 'acts' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for cataracts that I've seen before include "Large waterfalls and eye defects" , "Eye afflictions produce waterfalls" , "Waterfalls and eye diseases" , "Waterfalls in the eyes?" , "Eye problems causing blurred vision" .)