Accomplished musician excited Tom's ear (7)
I believe the answer is:
maestro
'accomplished musician' is the definition.
(a talented musician or conductor)
'excited tom's ear' is the wordplay.
'excited' indicates anagramming the letters.
'toms'+'ear'='tomsear'
'tomsear' is an anagram of 'MAESTRO'.
(Other definitions for maestro that I've seen before include "Some art (anag.)" , "Orchestral conductor" , "Good conductor" , "Eminent conductor or composer" , "great musician" .)