Crossword Genius

The execution period of a computer program (7)

Ross

I believe the answer is:

runtime

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

'the execution' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.

'period of a computer program' is the wordplay.
I cannot really understand how this works, but
'period' could be 'time' (period of time) and 'time' is present in the answer.
'program' could be 'run' (run is a kind of program) and 'run' is found within the answer.
This accounts for all the letters.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Times.
Want a hint initially instead of a full solution? Install my app