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Light, milk-based food with no topping (4)

Ross

I believe the answer is:

airy

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'topping' is the definition.
(thesaurus)

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(Other definitions for airy that I've seen before include "Well ventilated; insubstantial" , "Spacious; delicate" , "Old astronomer" , "Spacious - aerial" , "Fanciful" .)

I've seen this clue in The Times.
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