Noted guitarist left in band (5)
I believe the answer is:
slash
'noted guitarist' is the definition.
'slash' can be an answer for 'guitarist' (I have seen 'Legendary guitarist' mean 'slash' so perhaps 'guitarist' could also mean 'slash'). I'm unsure of the 'noted' bit.
'left in band' is the wordplay.
'left' becomes 'l' (common abbreviation).
'in' indicates putting letters inside.
'band' becomes 'sash' (sash is a kind of band).
'l' placed inside 'sash' is 'SLASH'.
Can you help me to learn more?
(Other definitions for slash that I've seen before include "rent" , "Cut; reduce drastically" , "Punctuation mark" , "Greatly reduce (prices)" , "Reduce (a price) greatly" .)