With revision tries to take the examination again (5)
I believe the answer is:
resit
'take the examination again' is the definition.
I can't tell whether this definition defines the answer.
'with revision tries' is the wordplay.
'with revision' indicates anagramming the letters.
'tries' anagrammed gives 'RESIT'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for resit that I've seen before include "second exam" , "tested again" , "repeated test" , "second try at test" , "Exam taken again" .)