Wild lad going after the female messenger (6)
I believe the answer is:
herald
'messenger' is the definition.
(I know that herald is a type of messenger)
'wild lad going after the female' is the wordplay.
'wild' indicates an anagram.
'going after' says to put letters next to each other.
'the female' becomes 'her' (I've seen this in another clue).
'lad' with letters rearranged gives 'ald'.
'ald' put after 'her' is 'HERALD'.
(Other definitions for herald that I've seen before include "Proclaimer" , "Proclaim the approach of, like old messenger" , "Proclaim the approach of, like archaic messenger" , "College of Arms official" , "Bringer of news" .)