Nothing interrupting dance band (4)
I believe the answer is:
hoop
'band' is the definition.
(I know that hoop is a type of band)
'nothing interrupting dance' is the wordplay.
'nothing' becomes 'O' (looks like zero - 0).
'interrupting' means one lot of letters goes inside another.
'dance' becomes 'hop' (hop is a kind of dance).
'o' placed into 'hop' is 'HOOP'.
(Other definitions for hoop that I've seen before include "Rigid circular band" , "children's toy" , "Circle, ring" , "Croquet target" , "Wood, metal or plastic band" .)