Cornea is damaged? One of those in theatre outlined this possibility! (8)

I believe the answer is:

scenario

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'one of those in theatre outlined this possibility' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

'cornea is damaged?' is the wordplay.
'damaged?' indicates anagramming the letters.
'cornea'+'is'='corneais'
'corneais' anagrammed gives 'SCENARIO'.

Can you help me to learn more?

(Other definitions for scenario that I've seen before include "Imagined situation" , "Dramatic situation" , "Production plan" , "play's outline" , "Imagined sequence" .)

I've seen this clue in the Irish Times.

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