Hang back in bar after time (5)
I believe the answer is:
trail
'hang back' is the definition.
(I know that hang back can be written as trail)
'bar after time' is the wordplay.
'bar' becomes 'rail' (rail is a kind of bar).
'after' says to put letters next to each other.
'time' becomes 't' (abbreviation).
'rail' put after 't' is 'TRAIL'.
'in' acts as a link.
(Other definitions for trail that I've seen before include "Beaten path; follow" , "Fall behind" , "Track - be behind" , "advertise upcoming programmes" , "Drag along the ground" .)