Moneylender who is retiring with some hair (7)
I believe the answer is:
shylock
'moneylender' is the definition.
(thesaurus)
'is retiring with some hair' is the wordplay.
'is retiring' becomes 'shy' (I've seen this in another clue).
'with' says to put letters next to each other.
'some hair' becomes 'lock' (lock is a kind of hair).
'shy'+'lock'='SHYLOCK'
'who' acts as a link.
(Other definitions for shylock that I've seen before include "27's usurer" , "Famous loner reportedly" , "Shakespearean character" , "Shakespearean moneylender" , "Miser" .)