Endure to the final (4)
I believe the answer is:
last
This clue is a double definition.
'endure' is the first definition.
(I know that endure can be written as last)
'the final' is the second definition.
(synonyms)
'to' is the link.
(Other definitions for last that I've seen before include "Cargo to stay fresh" , "Endure - this clue is!" , "ending a series" , "Cobbler's model shape" , "` `The cobler should stick to his ....' '" .)