Clue: To make up tale about Khuzdul, for starters – and Sauron, in the end – he did! (7)
Answer: TOLKIEN
Explanation: Definition: he did
An envelope ('about') of K ('**K**huzdul' for starters') in 'to' plus LIE ('make up *tale*') plus N ('**S**auron in the end'), with an extended definition – Khuzdul is a language of the Dwarfs, and Sauron the evil master in Tolkien's Middle Earth