Record single does rock event (7)
I believe the answer is:
episode
'event' is the definition.
(I've seen this before)
'record single does rock' is the wordplay.
'record' becomes 'ep'.
'single' becomes 'i' (one).
'rock' indicates anagramming the letters.
'does' anagrammed gives 'sode'.
'ep'+'i'+'sode'='EPISODE'
(Other definitions for episode that I've seen before include "One of a related series of events" , "Bout" , "Instalment; event" , "Distinctive incident" , "Incident in a story or part of a serial" .)