Most devious twist I found in exam (9)

I believe the answer is:

trickiest

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'most devious' is the definition.
Both the answer and definition are superlative adjectives. Maybe they are linked in a way I don't understand?

'twist i found in exam' is the wordplay.
'twist i' becomes 'ricki' (I can't justify this - if you can you should give a lot more credence to this answer).
'found in' means one lot of letters goes inside another.
'exam' becomes 'test' (synonyms).
'ricki' going inside 'test' is 'TRICKIEST'.

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I've seen this clue in The Guardian.

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