Painter's painter bound to flip about height (7)
I believe the answer is:
Here is my best explanation:
'painter's' is the definition.
'painter bound to flip about height' is the subsidiary indication.
'painter' becomes 'ra'.
'bound' becomes 'leap' ('leap' can be a synonym of 'bound'**).
'to flip' says the letters should be written backwards.
'about' is an insertion indicator.
'height' becomes 'h'.
'leap' reversed gives 'pael'.
'pael' placed around 'h' is 'phael'.
(Other definitions for raphael that I've seen before include "responsible for many religious works", "Fifteenth to sixteenth century Italian painter/architect", "It. painter; an archangel", "Master", "Italian Renaissance painter", "Sistine Madonna artist", "Artist", "A Renaissance artist", "An archangel; a painter" and "Italian painter; archangel".)