It'll emerge from sulphur left in furrow overwhelmed by poo (10)

I believe the answer is:

smelliness

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

'it'll emerge from sulphur left' is the definition.
I can't tell whether this definition defines the answer.

'furrow overwhelmed by poo' is the wordplay.
I cannot really see how this works, but
'furrow' could be 'line' (synonyms) and 'line' is located in the answer.
This explanation may well be incorrect...

'in' acts as a link.

Can you help me to learn more?

I've seen this clue in The Guardian.

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