Bully tired after start of belligerent argument (8)
I believe the answer is:
browbeat
'bully' is the definition.
(I've seen this before)
'tired after start of belligerent argument' is the wordplay.
'tired' becomes 'beat' ('beat' can be similar in meaning to 'tired'**).
'after' means one lot of letters go next to another.
'start of' suggests taking the first letters.
'argument' becomes 'row' (I've seen this before).
The first letter of 'belligerent' is 'b'.
'b'+'row'='brow'
'beat' after 'brow' is 'BROWBEAT'.
(Other definitions for browbeat that I've seen before include "Bully verbally" , "Intimidate, bulldoze" , "Bully or intimidate - using forehead?" , "Threaten - bully" , "cow" .)