Musician inspires scout to be prepared (13)
I believe the answer is:
percussionist
'musician' is the definition.
(percussionist is a kind of musician)
'inspires scout to be prepared' is the wordplay.
'to be prepared' indicates an anagram.
'inspires'+'scout'='inspiresscout'
'inspiresscout' is an anagram of 'PERCUSSIONIST'.
(Other definitions for percussionist that I've seen before include "Banger" , "Striking musician" , "Orchestral member" .)