Get it? Aim revised to become less harsh (8)
I believe the answer is:
mitigate
'become less harsh' is the definition.
I can't judge whether this definition defines the answer.
'get it? aim revised' is the wordplay.
'revised' is an anagram indicator.
'get'+'it'+'aim'='getitaim'
'getitaim' anagrammed gives 'MITIGATE'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for mitigate that I've seen before include "Reduce the severity of, say a sentence" , "Soften" , "Lessen the seriousness of" , "Make less harsh" , "Extenuate" .)