Simple, introductory (10)

I believe the answer is:

elementary

This clue is a double definition.

'simple' is the first definition.
(I know that simple can be written as elementary)

'introductory' is the second definition.
(similar in meaning)

(Other definitions for elementary that I've seen before include "One precursor to 7 [SECONDARY MODERN]" , "Simple, my dear Watson!" , "Basic, simple" , "Like some particles" , "Fundamental" .)

I've seen this clue in The Times.

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