Crossword Genius

Second time to stuff cushion, usually (4,5)

Ross

I believe the answer is:

most often

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

'usually' is the definition.
(thesaurus)

'second time to stuff cushion' is the wordplay.
I cannot really understand how this works, but
'second' could be 'mo' (both are short periods of time) and 'mo' is located in the answer.
'time' could be 'ten' (I've seen this before) and 'ten' is present in the answer.
'to' is within the answer.
This explanation may well be incorrect...

Can you help me to learn more?

I've seen this clue in The Sunday Times.
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