Dee gets a day's work, back in disgrace (7)
I believe the answer is:
degrade
'disgrace' is the definition.
(I know that disgrace can be written as degrade)
'dee gets a day's work back' is the wordplay.
'gets' is an insertion indicator (gets can mean captures or absorbs).
'a day's work' becomes 'darg' (I can't justify this - if you can you should give a lot more credence to this answer).
'back' says the letters should be written backwards.
'darg' reversed gives 'grad'.
'dee' enclosing 'grad' is 'DEGRADE'.
'in' acts as a link.
Can you help me to learn more?
(Other definitions for degrade that I've seen before include "Reduce in status or rank" , "Lower the quality of (something)" , "Demean, cheapen" , "Shame" , "Break down, deteriorate" .)