Try to listen (4)
I believe the answer is:
hear
I believe this is a double definition.
'try' is the first definition.
('hear' can be a synonym of 'try')
'listen' is the second definition.
(I've seen this before)
'to' is the link.
(Other definitions for hear that I've seen before include "receive information" , "Perceive audibly" , "to judge" , "Be informed of" , "Perceive aurally" .)