Try and learn (4)
I believe the answer is:
hear
I believe this is a double definition.
'try' is the first definition.
(as in to try someone in court or hear their case)
'learn' is the second definition.
(synonyms)
'and' acts as a link.
(Other definitions for hear that I've seen before include "attend" , "to judge" , "Perceive sound" , "receive information" , "Hark" .)