Wet weather? Sheep getting mostly lined up inside (9)
I believe the answer is:
rainstorm
'sheep getting mostly lined up inside' is the definition.
I can't judge whether this defines the answer.
'wet weather?' is the wordplay.
'wet' becomes 'rain' (wet weather).
'weather?' becomes 'storm' (I have seen 'Violent weather' mean 'storm' so perhaps 'weather' could also mean 'storm').
'rain'+'storm'='RAINSTORM'
Can you help me to learn more?
(Other definitions for rainstorm that I've seen before include "ferocious weather" , "In bad fall" , "Heavy downpour" , "Wild weather" , "squall" .)