Sings about spar (4)
I believe the answer is:
raps
'sings' is the definition.
The answer and definition can be both to do with communicating as well as being verbs in their -s form.
Maybe they are linked in a way I don't understand?
'about spar' is the wordplay.
'about' says the letters should be written backwards.
'spar' in reverse letter order is 'RAPS'.
Can you help me to learn more?
(Other definitions for raps that I've seen before include "Sprechgesang pop hits" , "Knocks sharply" , "'Knocks, on the door say (4)'" , "Cracks" .)