Crossword Genius

When one returned from Yosemite? (4)

Ross

I believe the answer is:

time

I'm a little stuck... Click here to teach me more about this clue!

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

'returned from yosemite?' is the wordplay.
'returned' says the letters should be written in reverse.
'from' indicates a hidden word.
'emit' is hidden within 'yosemite'.
'emit' back-to-front is 'TIME'.

Can you help me to learn more?

(Other definitions for time that I've seen before include "Rhythm" , "The fourth dimension?" , "Spell" , "See 15" , "Speech to close pub" .)

I've seen this clue in the Evening Standard.
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