Elementary (5)

I believe the answer is:

basic

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

This is the entire clue.

(Other definitions for basic that I've seen before include "Fundamental, underlying" , "essential" , "Fundamental, forming a starting-point" , "Plain" , "Staple; ordinary" .)

I've seen this clue in the Sydney Morning Herald, the Evening Standard, the USA Today, the Universal and The Times.

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