Colouring book containing words but no chapter by school (10)
I believe the answer is:
complexion
'colouring' is the definition.
(complexion is a kind of colouring)
'book containing words but no chapter by school' is the wordplay.
'book containing words' becomes 'lexicon' (lexicon can mean a dictionary).
'but no' indicates named letters should be taken away.
'chapter' becomes 'c' (abbreviation).
'by' is a charade indicator (letters next to each other).
'school' becomes 'comp' (short for comprehensive school).
'lexicon' with 'c' taken away is 'lexion'.
'lexion' put after 'comp' is 'COMPLEXION'.
(Other definitions for complexion that I've seen before include "Face" , "Nature" , "Skin's tone and texture" , "Skin tone" , "character" .)