Conscientiously, boss with debts starts learning yoga (10)
I believe the answer is:
studiously
'conscientiously' is the definition.
Both the definition and answer are adverbs. Perhaps you can see a link between them that I can't see?
'boss with debts starts learning yoga' is the wordplay.
'boss' becomes 'stud' (both can mean a metal decoration).
'with' says to put letters next to each other.
'debts' becomes 'IOUs' (promises to pay debts).
'starts' says to take the initial letters.
The initial letters of 'learning yoga' is 'ly'.
'stud'+'ious'+'ly'='STUDIOUSLY'
Can you help me to learn more?
(Another definition for studiously that I've seen is " with due diligence".)