It's not raining? Good! (4)
I believe the answer is:
fine
'good' is the definition.
(both can mean satisfactory)
'it's not raining?' is the wordplay.
I cannot really see how this works, but
'it' could be 'e' ('e' can mean 'electronic' which is similar to 'IT') and 'e' is present in the answer.
The remaining letters 'fin' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for fine that I've seen before include "Dry and sunny" , "Usual penalty for parking offence" , "Monetary penalty - that's splendid" , "Money penalty is clear and dry" , "Capital - punishment" .)