Crossword Genius

Announcement: 50% off diamonds! (3)

Ross

I believe the answer is:

ice

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

'diamonds' is the definition.
(slang term for diamonds)

I cannot 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 "Cold demeanour" , "Decorate with frosting" , "dessert" , "Cold stuff used in enticement" , "Cooler" .)

I've seen this clue in The Guardian.
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