Alternatively a learner will get a test (4)
I believe the answer is:
oral
'a test' is the definition.
(oral is a kind of test)
'alternatively a learner' is the wordplay.
'alternatively' becomes 'or'.
'learner' becomes 'l'.
'or'+'a'+'l'='ORAL'
'will get' is the link.
(Other definitions for oral that I've seen before include "Unwritten examination" , "Concerning the mouth" , "Related to the mouth" , "Using speech rather than writing" , "Kind of exam" .)