Crossword Genius

Produced farmyard noises, incorporating common vulgarity ultimately - this? (3,6)

Ross

I believe the answer is:

low comedy

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

'produced farmyard noises incorporating common vulgarity ultimately this?' is the definition.
The definition suggests a singular noun which matches the answer.

'common vulgarity ultimately this?' is the wordplay.
I cannot really see how this works, but
'common' could be 'low' (both can mean vulgar) and 'low' is found within the answer.
The remaining letters 'comedy' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Independent.
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