Water falling, cloud in sight? (8)

I believe the answer is:

cataract

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This clue could be a double definition.

'water' is the first definition.
(cataract is a kind of water)

'falling cloud in sight?' is the second definition.
'cataract' can be an answer for 'falling' (thesaurus). I'm not certain of the 'cloud in sight?' bit.

Can you help me to learn more?

(Other definitions for cataract that I've seen before include "Large waterfall" , "one may have causing blurred vision" , "what may have a bad effect on the viewer" , "Cascade; eye defect" , "Waterfall and eye defect" .)

I've seen this clue in The Independent.

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