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 can occasionally mean the same thing.

'a bit posh or synthetically affectedly' is the wordplay.
'a bit' says the answer is hidden in the clue (I've seen 'bit of' mean this).
'HORSY' is hidden within '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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