Thick paste of sugar and water, used for making sweets or icing cakes (7)

I believe the answer is:

fondant

(Other definitions for fondant that I've seen before include "Sugary paste for sweets" , "Thick sugar paste used for icing cakes" , "Soft sweet" , "Sweet paste of sugar, water, and flavouring" , "Thick creamy sugar paste" .)

I've seen this clue in The Guardian.

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