Crossword Genius

An indecorous utterance? (3)

Ross

I believe the answer is:

cor

I'm a little stuck... Click here to teach me more about this clue!

'utterance?' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I don't see?

'an indecorous' is the wordplay.
'COR' is hidden within the letters.
But, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for cor that I've seen before include "Surprised expression" , "Gosh" , "Blimey" , "Expression of surprise" .)

I've seen this clue in the Evening Standard.
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