Finish part of degree, never going back! (6)
I believe the answer is:
veneer
'finish' is the definition.
(I've seen this in another clue)
'part of degree never going back' is the wordplay.
'part of' says the answer is hidden in the clue.
'going back' says the letters should be written in reverse.
'reenev' is hidden in the letters of 'degree never'.
'reenev' backwards is 'VENEER'.
(Other definitions for veneer that I've seen before include "Specious outward appearance of good quality" , "Thin superficial layer" , "Thin covering of fine wood on a coarser one" , "Superficial polish" , "A thin outer layer" .)