Crossword Genius

Where a hack might be employed on occasion? (2,5)

Ross

I believe the answer is:

at times

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

'where a hack might be employed' is the definition.
I don't know anything about this answer so I cannot judge whether this works.

'on occasion?' is the wordplay.
I cannot quite see how this works, but
'on' could be 'at' (I've seen this in other clues) and 'at' is located in the answer.
'occasion?' could be 'time' (I've seen this before) and 'time' is located in the answer.
A single letter 's' remains which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for at times that I've seen before include "employed by paper?" , "Where some journalists work" , "Occasionally" , "Every so often" , "on some occasions" .)

I've seen this clue in The Independent.
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