Crossword Genius

A timepiece? (4,4)

Ross

I believe the answer is:

half hour

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'a timepiece?' is the definition.
Although both the answer and definition are singular nouns, I can't see how they can define each other.

This is all the clue.

Can you help me to learn more?

(Another definition for half hour that I've seen is " a while".)

I've seen this clue in the Evening Standard.
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