Clue: Thirteen Enigma Variations Elgar originally pictured within Nimrod puzzled composer (10)
Answer: MONTEVERDI
Explanation: Definition: composer

**T**(hirteen) **E**(nigma) **V**(ariations) **E**(lgar) [*originally*] *pictured within* ***(nimrod)** [anag:*puzzled*]
 

 
*Refers to Claudio Monteverdi, a late Renaissance Italian composer.