Crossword Genius

Chap raised undergarment greener than the others? (7)

Ross

I believe the answer is:

naivest

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'greener than the others?' is the definition.
I can't tell whether this definition defines the answer.

'chap raised undergarment' is the wordplay.
'chap' becomes 'ian' (man's name).
'raised' is a reversal indicator (going up in a down clue).
'undergarment' becomes 'vest' (vest is a kind of undergarment).
'ian' back-to-front is 'nai'.
'nai'+'vest'='NAIVEST'

Can you help me to learn more?

(Other definitions for naivest that I've seen before include "Least sophisticated" , "Most unsophisticated" , "far from the most wise?" , "very green" , "Most simple" .)

I've seen this clue in The Times.
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