Poor weather, so you'll find the artist at home (4)
I believe the answer is:
rain
'poor weather so you'll find' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.
'artist at home' is the wordplay.
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'at home' becomes 'in' ('I'm in' can mean 'I'm at home').
'ra'+'in'='RAIN'
'the' is the link.
Can you help me to learn more?
(Other definitions for rain that I've seen before include "Precipitation" , "Falling water" , "bad weather" , "Fall in large quantities" , "See 12" .)