Noodle is to get better outside (9)
I believe the answer is:
improvise
'noodle is to get better outside' is the definition.
I can't tell whether this definition defines the answer.
'is to get better outside' is the wordplay.
'to get better' becomes 'improve' (I've seen this in another clue).
'outside' indicates putting letters inside (some letters go outside others).
'is' inserted within 'improve' is 'IMPROVISE'.
Can you help me to learn more?
(Other definitions for improvise that I've seen before include "ad lib" , "Use whatever materials are to hand" , "play by ear" , "Ad-lib" , "Perform spontaneously" .)