I defy pupil scratching bottom crudely to get more upmarket (9)

I believe the answer is:

yuppified

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'get more upmarket' is the definition.
I can't judge whether this defines the answer.

'i defy pupil scratching bottom crudely' is the wordplay.
'scratching bottom' means to remove the last letter.
'crudely' indicates an anagram.
'i'+'defy'+'pupil'='idefypupil'
'idefypupil' with its final letter taken away is 'idefypupi'.
'idefypupi' with letters rearranged gives 'YUPPIFIED'.

'to' is the link.

Can you help me to learn more?

(Another definition for yuppified that I've seen is " Area so improved".)

I've seen this clue in The Independent.

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