Rude sprite with tie to king (8)
I believe the answer is:
improper
'rude' is the definition.
(thesaurus)
'sprite with tie to king' is the wordplay.
'sprite' becomes 'imp' (imp is a kind of sprite).
'with' says to put letters next to each other.
'tie' becomes 'rope' (roping is a kind of tiing).
'to king' becomes 'r' (r is abbreviation for rex).
'imp'+'rope'+'r'='IMPROPER'
(Other definitions for improper that I've seen before include "Not decorous or seemly" , "Indecent or unsuitable" , "Inappropriate" , "Not conforming to norms of conduct, maybe indecent" , "Not in accord with norms of behaviour" .)