Good form of one paid to imbue king with devotion (9)
I believe the answer is:
propriety
'good form' is the definition.
(thesaurus)
'one paid to imbue king with devotion' is the wordplay.
I cannot quite see how this works, but
'one' could be 'i' (Roman numeral) and 'i' is found in the answer.
'paid' could be 'pro' (I've seen this in other clues) and 'pro' is present in the answer.
'king' could be 'r' (abbreviation for rex, king in Latin) and 'r' is present in the answer.
This explanation may well be incorrect...
'of' is the link.
Can you help me to learn more?
(Other definitions for propriety that I've seen before include "Moral acceptability" , "Correct behaviour" , "Correctness of behaviour" , "Decorum" .)