Crossword Genius

I've an order that's simple (5)

Ross

I believe the answer is:

naive

'that's simple' is the definition.
(similar in meaning)

'i've an order' is the wordplay.
'order' is an anagram indicator.
'ive'+'an'='ivean'
'ivean' with letters rearranged gives 'NAIVE'.

(Other definitions for naive that I've seen before include "childlike" , "Unaffected; credulous" , "Simple, innocent or unsophisticated" , "Lacking wisdom and judgement" , "Lacking sophistication" .)

I've seen this clue in The Globe and Mail.
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