Treats ... treats injury (4)

I believe the answer is:

ices

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'treats injury' is the definition.
(ice therapy)

I don't understand the remainder of the clue.

(Other definitions for ices that I've seen before include "they may be held in the summer" , "Cold confections" , "Frozen sweets" , "Decorates cakes with frosting" , "ecorates with frosting" .)

I've seen this clue in The Everyman puzzle in The Observer.

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