Path back from student bar (5)
I believe the answer is:
trail
'path' is the definition.
(I know that trail is a type of path)
'back from student bar' is the wordplay.
'back from' indicates one should take the final letters (the letter at the back of the word).
'bar' becomes 'rail' (rail is a kind of bar).
The last letter of 'student' is 't'.
't'+'rail'='TRAIL'
(Other definitions for trail that I've seen before include "Dog - track" , "Track - be behind" , "Drag; path" , "Forest path" , "Rough track blazed through wild or hilly country" .)