Royal wrapping the present on purpose (9)
I believe the answer is:
knowingly
'on purpose' is the definition.
(thesaurus)
'royal wrapping the present' is the wordplay.
'royal' becomes 'kingly'.
'wrapping' is an insertion indicator.
'the present' becomes 'now' (now is a kind of present).
'kingly' enclosing 'now' is 'KNOWINGLY'.
(Other definitions for knowingly that I've seen before include "On purpose" , "Deliberately" .)