Clue: He sold material, part of scripts, writing in and changing each (5,6)
Answer: LINEN DRAPER
Explanation: Definition: He sold material
**LINE**="part of scripts", with **R**="writing" inside (and)*, plus **PER**="each"
 **R**="writing" as one of the three R's: **r**eading, w**r**iting, a**r**ithmetic