Bowler for example had to agree to differ (8)
I believe the answer is:
headgear
'bowler for example' is the definition.
(I know that bowler hat is a type of hat)
'had to agree to differ' is the wordplay.
'to' is a charade indicator (letters next to each other).
'to differ' is an anagram indicator.
'had'+'agree'='hadagree'
'hadagree' with letters rearranged gives 'HEADGEAR'.
(Other definitions for headgear that I've seen before include "Trilby e.g" , "cap, say" , "Hats, helmets etc." , "Mortarboard < , especially" , "crown, say" .)