Drops cataracts (5)
I believe the answer is:
I believe this clue is a double definition.
'drops' is the first definition.
(I know this)
'cataracts' is the second definition.
(I've seen this in another clue)
(Other definitions for falls that I've seen before include "See 6 Down" , "Forces" , "Victoria or Niagara, for example" , "Goes down" , "Drops" .)