Crossword Genius

Prompt brief mention in performance (2,4)

Ross

I believe the answer is:

on time

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

'prompt' is the definition.
(synonyms)

'brief mention in performance' is the wordplay.
I cannot quite see how this works, but
'in performance' could be 'on' and 'on' is found within the answer.
The remaining letters 'time' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for on time that I've seen before include "as expected" , "according to schedule" , "Not running late" , "Prompt" , "Punctual, not late" .)

I've seen this clue in The Independent.
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