Crossword Genius

Introductory textbook, gloss over it perhaps? (6)

Ross

I believe the answer is:

primer

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'introductory textbook' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

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(Other definitions for primer that I've seen before include "First coat - book" , "Basic teaching book" , "Introductory textbook or first coat of paint" , "School textbook" , "Solitary" .)

I've seen this clue in The Telegraph.
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