Foreigners like eating porky new starter (6)
I believe the answer is:
aliens
'foreigners' is the definition.
('alien' can be a synonym of 'foreigner')
'like eating porky new starter' is the wordplay.
'like' becomes 'as'.
'eating' means one lot of letters goes inside another.
'porky' becomes 'lie' (I've seen this in other clues).
'starter' suggests taking the first letters.
The initial letter of 'new' is 'n'.
'lie'+'n'='lien'
'as' placed around 'lien' is 'ALIENS'.
(Other definitions for aliens that I've seen before include "Non-nationals - perhaps from Mars?" , "Science-fiction creatures" , "'Little green men'?" , "Strange forms of life" , "Outer space creatures, perhaps from Mars?" .)