Discusses reasons (6)
I believe the answer is:
argues
This might be a double definition.
'discusses' is the first definition.
The answer and definition can be both to do with communicating as well as being verbs in their -s form.
Maybe there's an association between them I don't understand?
'reasons' is the second definition.
('argue' can be a synonym of 'reason')
Can you help me to learn more?
(Other definitions for argues that I've seen before include "Quarrels or disagrees" , "Disputes, proposes the contrary" , "Debates or bickers" , "Disputes, contends verbally" , "Contends, debates" .)