Decorate a cake (3)

I believe the answer is:

ice

'decorate a cake' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for ice that I've seen before include "Finish decorating the Christmas cake" , "Top cake" , "Diamonds (sl)" , "Diamonds (informal)" , "Formality" .)

I've seen this clue in the Penny Press, The Irish Times, the King Feature Syndicate, The Star Tribune, the Sydney Morning Herald, the Canadiana, The Mirror and the Irish Times (Simplex).

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