Commercial outfit beginning to export electronic letter opener (9)
I believe the answer is:
addressee
'letter opener' is the definition.
(person who receives and opens a letter)
'commercial outfit beginning to export electronic' is the wordplay.
'commercial' becomes 'ad' (abbreviation for advertisement).
'outfit' becomes 'dress' (I've seen this in another clue).
'beginning to' indicates taking the first letters.
The first letters of 'export electronic' is 'ee'.
'ad'+'dress'+'ee'='ADDRESSEE'
(Other definitions for addressee that I've seen before include "one who's likely to get the post" , "He gets a letter" , "He's written to" , "Person named on an envelope" , "Person whose name is on the envelope" .)