For the not very intelligent, it's easy (6)

I believe the answer is:

simple

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'it's easy' is the definition.
(associated in meaning)

I don't understand how the rest of the clue works.

(Other definitions for simple that I've seen before include "Easily done/understood" , "Plant with medicinal properties" , "Easy to understand" , "Easily done" , "Elementary" .)

I've seen this clue in the Evening Standard.

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