Endlessly try to move towards the finish of trainee's course (7)
I believe the answer is:
aintree
'endlessly try to move towards the finish' is the definition.
I don't know anything about this answer so I can't tell whether it can be defined by this definition.
'trainee's course' is the wordplay.
'course' indicates anagramming the letters (course can mean to flow or move around).
'trainee' anagrammed gives 'AINTREE'.
'of' is the link.
Can you help me to learn more?
(Other definitions for aintree that I've seen before include "place for horse racing" , "Trainee in Grand National venue" , "Grand National course" , "Liverpool's racecourse" , "Venue of the Grand National race" .)