Crossword Genius

Distil rare gin closer to boiling point? (7)

Ross

I believe the answer is:

angrier

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

'closer to boiling point?' is the definition.
I can't tell whether this definition defines the answer.

'distil rare gin' is the wordplay.
'rare gin' can be anagrammed to 'ANGRIER'.
But, I am unsure how the anagram is indicated.

Can you help me to learn more?

(Other definitions for angrier that I've seen before include "More irate" , "More worked up" , "More annoyed" , "More furious" , "Not so calm" .)

I've seen this clue in The Independent.
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