Giving up time for pay, one's still working thus? (14)

I believe the answer is:

professionally

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'thus?' is the definition.
Both the definition and answer are adverbs. Maybe you can see a link between them that I can't see?

'giving up time for pay one's still working' is the wordplay.
'giving up' suggests deleting specific letters.
'time' becomes 't' (abbreviation).
'working' indicates anagramming the letters.
'for'+'pay'+'ones'+'still'='forpayonesstill'
'forpayonesstill' with 't' taken out is 'forpayonessill'.
'forpayonessill' with letters rearranged gives 'PROFESSIONALLY'.

Can you help me to learn more?

(Other definitions for professionally that I've seen before include "in expert fashion" , "Very skilfully and competently" .)

I've seen this clue in The Telegraph.

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