Message heads to the West encrypted and in Latin (5)
I believe the answer is:
tweet
'message' is the definition.
(I've seen this before)
'heads to the west encrypted and in latin' is the wordplay.
'heads to' suggests taking the first letters (I've seen 'head to' mean this).
'and in latin' becomes 'et' ('and' in Latin).
The first letters of 'the west encrypted' is 'twe'.
'twe'+'et'='TWEET'
(Other definitions for tweet that I've seen before include "Twitter" , "sound made by bird" , "call" , "Chirrup" , "Note from flier" .)