Crossword Genius

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.
Maybe they are linked in a way I don't understand?

'indecorous' is the wordplay.
'COR' is hidden in amongst the letters.
But, I'm uncertain how the hidden word is indicated.

Can you help me to learn more?

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

I've seen this clue in the Evening Standard.
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