Innocent, ingenuous (5)

I believe the answer is:

naive

I believe this is a double definition.

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

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

(Other definitions for naive that I've seen before include "Excessively trusting or innocent" , "Short on experience" , "Lacking sophistication" , "Innocent or not worldly enough" , "Ingenuous, easily deceived" .)

I've seen this clue in The Telegraph.

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