Satire regularly annoys foreigners (9)
I believe the answer is:
strangers
'foreigners' is the definition.
(I've seen this before)
'satire regularly annoys' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
'annoys' becomes 'angers' (I've seen this before).
The alternate letters of 'satire' are 'str'.
'str'+'angers'='STRANGERS'
(Other definitions for strangers that I've seen before include "Those we have not met" , "People one doesn't know" , "Foreigners" , "Outsiders" , "Aliens" .)