Crossword Genius

Delayed expression of approval? (2,3)

Ross

I believe the answer is:

on ice

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

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

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(Other definitions for on ice that I've seen before include "kept for later" , "In poky alone" , "held back?" , "Kept in readiness" , "Shelved" .)

I've seen this clue in The Times.
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