Filmed Butler, short of time, discovered jester's OTT speech (8)

I believe the answer is:

rhetoric

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'speech' is the definition.
(rhetoric is a kind of speech)

I don't understand the remainder of the clue.

(Other definitions for rhetoric that I've seen before include "Language used for impressive or exaggerated sound" , "Art of impressive public speaking" , "Torchier with language of orator" , "address" , "Empty words?" .)

I've seen this clue in The Independent.

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