Inapt declaration of rugby player meeting Queen (8)
I believe the answer is:
improper
'inapt' is the definition.
(thesaurus)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for improper that I've seen before include "Indecent, unseemly" , "Indecent or unsuitable" , "Incorrect or wrong, say behaviour" , "Not in line with accepted standards of morality" , "Inappropriate" .)