Learner driver's support when bad weather intervenes (7)
I believe the answer is:
trainee
'learner' is the definition.
(thesaurus)
'driver's support when bad weather intervenes' is the wordplay.
'driver's support' becomes 'tee' (support for someone driving in golf).
'when bad weather' becomes 'rain' (I can't justify this - if you can you should believe this answer much more).
'intervenes' is an insertion indicator.
'tee' enclosing 'rain' is 'TRAINEE'.
Can you help me to learn more?
(Other definitions for trainee that I've seen before include "Person being instructed in work" , "One being taught a job" , "One being instructed" , "Student" , "novice" .)