Flustered impregnators peg out in downpour (9)
I believe the answer is:
rainstorm
'downpour' is the definition.
(I have seen 'Heavy downpour' mean 'rainstorm' so perhaps 'downpour' could also mean 'rainstorm')
'flustered impregnators peg out' is the wordplay.
'flustered' indicates an anagram.
'out' suggests deleting specific letters.
'impregnators' with 'peg' removed is 'imrnators'.
'imrnators' anagrammed gives 'RAINSTORM'.
'in' is the link.
(Other definitions for rainstorm that I've seen before include "Heavy fall" , "Heavy downpour" , "Wild weather" , "squall" , "In bad fall" .)