Place I mentioned in communications (5)
I believe the answer is:
india
This clue is a double definition.
'place' is the first definition.
(I've seen this before)
'i mentioned in communications' is the second definition.
(India is I in the NATO alphabet for radio calls)
(Other definitions for india that I've seen before include "Large subcontinent of Asia" , "Land in Asia" , "The world's most populous democracy" , "Comms code for I" , "where to ring for help?" .)