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.
Maybe you can see an association between them that I can't see?
I cannot 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" .)