Elementary, simple (5)

I believe the answer is:

basic

I believe this clue is a double definition.

'elementary' is the first definition.
(similar in meaning)

'simple' is the second definition.
(synonyms)

(Other definitions for basic that I've seen before include "Fundamental; alkaline" , "At the lowest level" , "Fundamental or rudimentary" , "Elemental" , "Key" .)

I've seen this clue in The Times.

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