Voluntarily avoids having worries about planet (8)
I believe the answer is:
forbears
'voluntarily avoids' is the definition.
I can't judge whether this definition defines the answer.
'worries about planet' is the wordplay.
'worries' becomes 'fears' (fearing is a kind of worrying).
'about' indicates putting letters inside.
'planet' becomes 'orb' (I've seen this in another clue).
'fears' going around 'orb' is 'FORBEARS'.
'having' is the link.
Can you help me to learn more?
(Other definitions for forbears that I've seen before include "Refrains or abstains from" , "Keeps in check" , "Desists" , "doesn't!" .)