Crossword Genius

Not hot diamonds (3)

Ross

I believe the answer is:

ice

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

'hot diamonds' is the definition.
(I've seen this in another clue)

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

Can you help me to learn more?

(Other definitions for ice that I've seen before include "engine" , "Girl's best friends" , "Frozen liquid" , "Diamond" , "Precious stones" .)

I've seen this clue in The Globe and Mail.
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