Serves up Mexican dish in the foreign place (6)
I believe the answer is:
Here is my best explanation:
'place' is the definition.
('locate' can be a synonym of 'place')
'serves up mexican dish in the foreign' is the subsidiary indication.
'serves up' says the letters should be written backwards.
'mexican dish' becomes 'taco' (I've seen this before).
'in' means one lot of letters goes inside another.
'the foreign' becomes 'el'.
'taco' inserted inside 'el' is 'etacol'.
'etacol' in reverse letter order is 'locate'.
(Other definitions for locate that I've seen before include "Find, or establish in particular place", "Find out where something is", "Establish", "Discover the place where something is", "Pinpoint, find", "Set in a particular place", "Fix position of", "spot", "Place (something)" and "Put in place".)