Following instructions, debit one to order (8)
I believe the answer is:
obedient
'following instructions' is the definition.
(I've seen this before)
'debit one to order' is the wordplay.
'to order' indicates anagramming the letters.
'debit'+'one'='debitone'
'debitone' with letters rearranged gives 'OBEDIENT'.
(Other definitions for obedient that I've seen before include "Passive" , "Ready to submit to authority" , "Complying with orders" , "Doing what one is told, compliant" , "Submissive, biddable" .)