Display by top-class band (6)
I believe the answer is:
airing
'display' is the definition.
(thesaurus)
'by top-class band' is the wordplay.
'by' says to put letters next to each other.
'top class' becomes 'ai' (I've seen this in other clues).
'band' becomes 'ring' (ring is a kind of band).
'ai' put next to 'ring' is 'AIRING'.
(Other definitions for airing that I've seen before include "Expressing (an opinion) publicly" , "Broadcasting" , "excursion" , "Expressing (a grievance) publicly" , "Ventilating, say a grievance" .)