It's worth obtaining work that's routine (8)
I believe the answer is:
practice
'routine' is the definition.
(thesaurus)
'it's worth obtaining work' is the wordplay.
I cannot quite understand how this works, but
'work' could be 'act' ('act' can be a synonym of 'work') and 'act' is found within the answer.
'worth' could be 'price' (price is a kind of worth) and 'price' is located in the leftover letters.
This accounts for all the letters.
This explanation may well be incorrect...
'that's' acts as a link.
Can you help me to learn more?
(Other definitions for practice that I've seen before include "Team of doctors" , "''. . . . . . . . maked perfect''" , "Professional business of doctor or lawyer" , "Exercise; professional business" , "It makes perfect, they say" .)