Some wet weather is welcome (4)
I believe the answer is:
hail
This might be a double definition.
'some wet weather' is the first definition.
'hail' can be an answer for 'weather' (hail is a kind of weather). I'm unsure of the 'some wet' bit.
'welcome' is the second definition.
('hail' is a greeting or welcome)
'is' acts as a link.
Can you help me to learn more?
(Other definitions for hail that I've seen before include "Acclaim; frozen rain" , "Precipitation - old greeting" , "Fall of ice" , "Greet; frozen rain" , "come down hard" .)