Crossword Genius

If gorge seems treacherous, it's because it's more misty (7)

Ross

I believe the answer is:

foggier

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'more misty' is the definition.
('foggy' can be a synonym of 'misty')

'if gorge seems treacherous it's because' is the wordplay.
'if gorge' anagrams to 'FOGGIER'.
However, I'm unsure how the anagram is indicated.

'it's' is the link.

Can you help me to learn more?

(Another definition for foggier that I've seen is " increasingly steamy".)

I've seen this clue in The Irish Times.
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