Follow male leaving the bar (5)
I believe the answer is:
trail
'follow' is the definition.
(thesaurus)
'male leaving the bar' is the wordplay.
'male' becomes 'he'.
'leaving' indicates named letters should be taken away.
'bar' becomes 'rail' (rail is a kind of bar).
'the' with 'he' taken away is 't'.
't'+'rail'='TRAIL'
(Other definitions for trail that I've seen before include "Drop behind" , "Be losing; track" , "Scent or track followed in hunting" , "Beaten path through the countryside" , "Track, route" .)