Lout bringing lad up (3)
I believe the answer is:
yob
'lout' is the definition.
(I've seen this before)
'lad up' is the wordplay.
'lad' becomes 'boy' (I've seen this before).
'up' is a reversal indicator (in down clue: letters go upwards).
'boy' reversed gives 'YOB'.
'bringing' is the link.
(Other definitions for yob that I've seen before include "Thug" , "Troublemaker" , "Loutish young man" , "Hooligan, ruffian" , "Tough" .)