Celebrates dancing round piano, upright (11)
I believe the answer is:
respectable
'upright' is the definition.
(thesaurus)
'celebrates dancing round piano' is the wordplay.
'dancing' is an anagram indicator.
'round' indicates putting letters inside.
'piano' becomes 'p'.
'celebrates' anagrammed gives 'resectable'.
'resectable' placed around 'p' is 'RESPECTABLE'.
(Other definitions for respectable that I've seen before include "Worthy, honest" , "Decent" , "Proper and good" , "fit for proper society?" , "OK" .)