Crossword Genius

Time to turn in, the soldier reveals (5)

Ross

I believe the answer is:

eight

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for eight that I've seen before include "No. of stones in cwt." , "23" , "Cube root of five hundred and twelve" , "Oxford crew, perhaps?" , "power of two" .)

I've seen this clue in the Evening Standard.
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