Sluggard left Arizona, back to play percussion instrument (9)
I believe the answer is:
lazybones
'sluggard' is the definition.
(thesaurus)
'left arizona back to play percussion instrument' is the wordplay.
'left' becomes 'L' (common abbreviation).
'arizona' becomes 'az' (I've seen this in other clues).
'back to' says to take the final letters.
'percussion instrument' becomes 'bones' (bones is a kind of percussion instrument).
The final letter of 'play' is 'y'.
'l'+'az'+'y'+'bones'='LAZYBONES'
(Other definitions for lazybones that I've seen before include "Couch potato?" , "Shirker" , "Slacker" , "Idle type" , "Idler (colloq.)" .)