Crossword Genius

Obviously cut down on workload but forced to come in (9)

Ross

I believe the answer is:

doubtless

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'obviously' is the definition.

'cut down on workload but forced to come in' is the wordplay.
I cannot quite see how this works, but
'down' could be 'd' and 'd' is located in the answer.
an anagram of 'but' is 'ubt' which is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for doubtless that I've seen before include "Definitely not" , "of course" , "Probably, certainly" , "Unquestionably" , "Positive" .)

I've seen this clue in The Guardian.
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