Crossword Genius

Posh folk gradually changing sides (6)

Ross

I believe the answer is:

gentry

I'm a little stuck... Click here to teach me more about this clue!

'posh folk' is the definition.
'gentry' can be an answer for 'folk' (thesaurus). I am not sure about the 'posh' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for gentry that I've seen before include "who are noble" , "People of social rank just below nobility" , "They're next below the nobility in position and birth" , "cream?" , "Privileged class" .)

I've seen this clue in The Independent.
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