Some of the reasons reporter's learned? (4)
I believe the answer is:
whys
'some of the reasons' is the definition.
'reporter's learned?' is the wordplay.
'reporter's' shows a homophone (sound like) (report can mean to speak something aloud).
'learned?' becomes 'wise' (I've seen this in other clues).
'wise' is a homophone of 'WHYS'.
(Other definitions for whys that I've seen before include "Causes underlying an action or situation" , "explanations" , "Reasons" , "They partner "wherefores"" .)