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, past participle verbs and adjectives sometimes mean the same thing.

'a bit posh or synthetically affectedly' is the wordplay.
'a bit' indicates the answer is hidden within the clue (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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