A bit posh or synthetically, affectedly refined in speech (5)

I believe the answer is:

horsy

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'refined in speech' is the definition.
The answer and definition are different parts of speech. However, adjectives and past participle verbs occasionally define each other.

'a bit posh or synthetically affectedly' is the wordplay.
'a bit' indicates a hidden word (I've seen 'bit of' mean this).
'HORSY' is hidden in the letters of 'posh or synthetically affectedly'.

Can you help me to learn more?

(Another definition for horsy that I've seen is " of the Badminton racket?".)

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