Sincerely (5)
'sincerely' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for earnestly that I've seen before include "Showing serious intent" , "Relent, say, in sincere and serious manner" , "with heart and soul" , "with gusto" , "In all seriousness" .)
'sincerely' is the definition.
(thesaurus)
This is all the clue.
(Another definition for genuinely that I've seen is " Truly".)
'sincerely' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for truly that I've seen before include "Indeed" , "Honestly" , "Verily" , "Genuinely, properly" , "Really, genuinely" .)