Brings up return of routine work, ends in more stress (8)
I believe the answer is:
nurtures
'brings up' is the definition.
('nurture' can be a synonym of 'bring up')
'return of routine work ends in more stress' is the wordplay.
'return of' says the letters should be written backwards.
'routine' becomes 'rut' (rut is a kind of routine).
'work' becomes 'run' (both can mean to operate something).
'ends in more stress' becomes 'es' (I can't explain this - if you can you should believe this answer much more).
'rut'+'run'='rutrun'
'rutrun' backwards is 'nurtur'.
'nurtur'+'es'='NURTURES'
Can you help me to learn more?
(Other definitions for nurtures that I've seen before include "Helps develop and grow" , "Cultivates" .)