Producer about to interrupt Rocky actor (7)
I believe the answer is:
creator
'producer' is the definition.
(I've seen this in another clue)
'about to interrupt rocky actor' is the wordplay.
'about' becomes 're' ('re' means regarding or about).
'to interrupt' indicates putting letters inside.
'rocky' indicates an anagram (letters rocked or thrown around).
'actor' is an anagram of 'cator'.
're' inserted inside 'cator' is 'CREATOR'.
(Other definitions for creator that I've seen before include "Person who makes or invents things" , "Someone who makes something" , "Maker" , "Inventor" , "The Almighty" .)