Try out (4)
'try out' is the definition.
(I know that try out can be written as test)
This is all the clue.
(Other definitions for test that I've seen before include "Try, examine critically" , "Examine to play international cricket match" , "See if you can" , "type of examination" , "Trial; exam" .)
'try out' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for use that I've seen before include "Employ or exploit" , "Resort to - operation" , "Sue for employment" , "Exploit unfairly" , "exercise" .)