21 across
Check
what
comes
down
gets
picked
up
(4)
Check what comes down gets picked up (4)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
The definition is Check, meaning to restrain or hold back. What comes down is rain, and gets picked up tells you it's a homophone — say "rain" in your ear and you've got it.