Get through to everyone at the far end (5)
I believe the answer is:
reach
'get through to' is the definition.
(synonyms)
'everyone at the far end' is the wordplay.
'everyone' becomes 'each' (I've seen this before).
'at' means one lot of letters go next to another (I've seen this in other clues).
'end' says to take the final letters.
The final letter of 'far' is 'r'.
'each' put after 'r' is 'REACH'.
(Other definitions for reach that I've seen before include "Extend an arm" , "Attain; extend to" , "compass" , "Scope; get to" , "Stretch of a river between two bends" .)