Make it more bearable and fairer (7)
I believe the answer is:
lighten
'make' is the definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Perhaps there's an association between them I don't understand?
I don't understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for lighten that I've seen before include "lift" , "Thin leg (anag.)" , "make fairer" , "Ease burden or reduce weight" , "cheer" .)