Try and catch (4)
I believe the answer is:
hear
I believe this clue is a double definition.
'try' is the first definition.
(as in to try someone in court or hear their case)
'catch' is the second definition.
(to catch something is to hear it being spoken)
'and' acts as a link.
(Other definitions for hear that I've seen before include "learn" , "Perceive aurally" , "Pay attention" , "Be informed of" , "Perceive with the ear" .)