Crossword Genius

Really hot in two ways? (6)

Ross

I believe the answer is:

sultry

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

'really hot' is the definition.
'sultry' can be an answer for 'hot' (similar in meaning). I'm unsure of the 'really' bit.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for sultry that I've seen before include "Such weather is hot and oppressive" , "Such weather is close and oppressive" , "Close -- sensual" , "Hot and steamy" , "Passionate" .)

I've seen this clue in The Sun.
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