Wire (5)
'wire' is the definition.
(cable is a kind of wire)
This is the entire clue.
(Other definitions for cable that I've seen before include "Strong rope made of twisted strands of hemp, nylon or steel wire" , "Telegram; wire rope" , "Wire; message" , "Strong suspension bridge made of wire" , "A message transmitted" .)
(Other definitions for send that I've seen before include "Transport" , "Despatch, remit" , "and 2: Advise" , "Dispatch by post" , "Mail" .)