Commercial prepared as directed (9)
I believe the answer is:
addressed
'directed' is the definition.
('address' can be a synonym of 'direct')
'commercial prepared' is the wordplay.
'commercial' becomes 'ad' (abbreviation for advertisement).
'prepared' becomes 'dressed' (definitely for salad).
'ad'+'dressed'='ADDRESSED'
'as' is the link.
(Other definitions for addressed that I've seen before include "Marked mail with its destination" , "Attended to" , "Gave a speech to" , "Dealt with" , "Spoken to" .)