Completely with one featuring in Carry On Muse (8)

I believe the answer is:

calliope

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'muse' is the definition.
(Calliope is an example)

I can't explain the remainder of the clue.

(Other definitions for calliope that I've seen before include "inspiration for poets" , "Greek Muse of eloquence and epic poetry, or a kind of organ" , "One of the Muses" , "something powered by steam" , "One Muse" .)

I've seen this clue in The Telegraph.

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