Paint book (6)

I believe the answer is:

primer

I believe this clue is a double definition.

'paint' is the first definition.
(primer is a kind of paint)

'book' is the second definition.
(primer is a kind of book)

(Other definitions for primer that I've seen before include "He charges" , "Educational book" , "Introductory textbook or first coat of paint" , "Initial coat of paint" , "it might be used by one 7 [PAINTING]" .)

I've seen this clue in The Guardian and The Independent.

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