Royal house -- time for Charlie to show appreciation? (6)
I believe the answer is:
palate
'appreciation?' is the definition.
(thesaurus)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for palate that I've seen before include "relish" , "Sense of taste at roof of mouth" , "One may savour" , "having ability to appreciate good food" , "where taste is considered" .)