Accomplished musician bent Tom's ear (7)
I believe the answer is:
maestro
'accomplished musician' is the definition.
(a talented musician or conductor)
'bent tom's ear' is the wordplay.
'bent' is an anagram indicator.
'toms'+'ear'='tomsear'
'tomsear' is an anagram of 'MAESTRO'.
(Other definitions for maestro that I've seen before include "Are most in favour of a foreign master?" , "Good conductor" , "Eminent musician" , "great expert" , "Genius possibly" .)