Sport label permitted nines to be dressed up (5,6)
I believe the answer is:
table tennis
'sport' is the definition.
(I know that table tennis is a type of ball sport)
'label permitted nines to be dressed up' is the wordplay.
'label' becomes 'tab' (I've seen this in another clue).
'permitted' becomes 'let' (to let something happen is to permit it).
'to be dressed up' is an anagram indicator.
'nines' with letters rearranged gives 'ennis'.
'tab'+'let'+'ennis'='TABLE-TENNIS'
(Other definitions for table tennis that I've seen before include "Ping pong" , "Indoor game" , "Ping-pong" , "sport" .)