Crossword Genius

One hundred taken on by champion simultaneously (2,4)

Ross

I believe the answer is:

at once

'simultaneously' is the definition.
(I've seen this in another clue)

'one hundred taken on by champion' is the wordplay.
'one hundred' becomes 'ton' (ton can informally mean a hundred).
'taken on by' indicates putting letters inside (inserted letters get taken on or taken in).
'champion' becomes 'ace' (both can mean a person excelling at something).
'ton' inserted inside 'ace' is 'AT ONCE'.

(Other definitions for at once that I've seen before include "simultaneously" , "'Without delay (2,4)'" , "right away" , "'Immediately (2,4)'" , "from the kick-off" .)

I've seen this clue in The Guardian.
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