Actor that's annoying and creepy regularly scratched graffiti in the toilet (8,6)
I believe the answer is:
humphrey bogart
'actor' is the definition.
(Humphrey Bogart is an example)
'that's annoying and creepy regularly scratched graffiti in the toilet' is the wordplay.
'that's annoying' becomes 'humph' (expression of annoyance).
'and' means one lot of letters go next to another.
'regularly scratched' indicates alternate letters (letters removed or scratched at regular intervals).
'graffiti in the toilet' becomes 'bogart' (I can't explain this - if you can you should give a lot more credence to this answer).
The alternate letters of 'creepy' are 'rey'.
'humph'+'rey'+'bogart'='HUMPHREY BOGART'
(Another definition for humphrey bogart that I've seen is " 1951 Best Actor Oscar winner for "The African Queen"".)