Fate rich worry about - someone stealing their estate perhaps (3,5)
I believe the answer is:
car thief
'someone stealing their estate perhaps' is the definition.
I don't know anything about this answer so I cannot judge whether it can be defined by this definition.
'fate rich worry' is the wordplay.
'worry' indicates anagramming the letters.
'fate'+'rich'='faterich'
'faterich' with letters rearranged gives 'CAR THIEF'.
'about' acts as a link.
Can you help me to learn more?
(Another definition for car thief that I've seen is " Chief rat (anag) - appropriator of vehicles".)