Crossword Genius

Elementary textbook (6)

Ross

I believe the answer is:

primer

'elementary textbook' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for primer that I've seen before include "explosive device" , "Introductory textbook or first coat of paint" , "Preparatory coat of paint" , "Basic book; undercoat" , "First coat - book" .)

I've seen this clue in The Guardian, The Sun, the Sydney Morning Herald and The Telegraph.
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