Crossword Genius

One cast left in hovel with oppressive atmosphere (10)

Ross

I believe the answer is:

stiflingly

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

'with oppressive atmosphere' is the definition.

'one cast left in hovel' is the wordplay.
I cannot quite see how this works, but
'one' could be 'li' (I've seen this in other clues) and 'li' is found in the answer.
'left' could be 'l' (common abbreviation) and 'l' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Times.
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