Crossword Genius

Wait for a PC to come back (8,4)

Ross

I believe the answer is:

response time

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'wait' is the definition.
The definition and answer can be both related to time as well as being singular nouns.
Maybe they are linked in a way I don't understand?

I can't explain the rest of the clue.

Can you help me to learn more?

(Another definition for response time that I've seen is " Delay between request and action".)

I've seen this clue in The Sunday Times and The Times.
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