Sends farewell to a redhead (6)
I believe the answer is:
radios
'sends' is the definition.
The definition and answer can be both to do with communicating as well as being verbs in their -s form.
Perhaps you can see a link between them that I don't see?
'farewell to a redhead' is the wordplay.
'farewell' becomes 'adios' (adios is a kind of farewell).
'to a' says to put letters next to each other (I've seen this in other clues).
'redhead' becomes 'r' (the head letter of red).
'adios' after 'r' is 'RADIOS'.
Can you help me to learn more?
(Other definitions for radios that I've seen before include "Broadcast receivers" , "broadcasters?" , "Audio receivers" , "Wirelesses" , "Communication devices" .)