Disdainful look that puts me out for half an hour (4)

I believe the answer is:

moue

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'hour' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

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

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(Other definitions for moue that I've seen before include "expression of displeasure" , "Disdainful pout" , "Sulky expression" , "Insolent pout" , "Expression of disdain" .)

I've seen this clue in the Evening Standard.

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