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Oscar Wilde's 'Miss' who upsets 'Sir' during the afternoon (5)

Ross

I believe the answer is:

prism

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'oscar wilde's miss who' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'upsets sir during the afternoon' is the wordplay.
'upsets' says the letters should be written backwards.
'during' indicates putting letters inside.
'the afternoon' becomes 'pm'.
'sir' written backwards gives 'ris'.
'ris' placed inside 'pm' is 'PRISM'.

Can you help me to learn more?

(Other definitions for prism that I've seen before include "Transparent solid for dispersing light" , "Triangular glass shape, breaks up light" , "Prims (anag)" , "Glass shape splitting white light into a spectrum" , "Optical device used to invert an image" .)

I've seen this clue in the Evening Standard.
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