Rash tip about musician (7)
I believe the answer is:
harpist
'musician' is the definition.
(harpist is a kind of musician)
'rash tip about' is the wordplay.
'about' is an anagram indicator.
'rash'+'tip'='rashtip'
'rashtip' with letters rearranged gives 'HARPIST'.
(Other definitions for harpist that I've seen before include "musician" , "Instrumentalist" , "Stringed instrument player" .)