Textbook (6)

I believe the answer is:

primer

'textbook' is the definition.
(primer is a kind of textbook)

This is the entire clue.

(Other definitions for primer that I've seen before include "Preparatory coat of paint" , "Elementary text book" , "He charges" , "Basic teaching book" , "Sealant coat" .)

I've seen this clue in the Evening Standard.

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