I'm out to get a radio part, speaking with style (5)

I believe the answer is:

idiom

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'style' is the definition.
(idiom is a kind of style)

I cannot understand how the remainder of the clue works.

(Other definitions for idiom that I've seen before include "Language used by people or group, vernacular" , "Language peculiar to a particular group" , "Phrase with a meaning that is not literal" , "Word usage peculiar to a specific group" , "Manner of speaking or writing" .)

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