Leave it to Mama's Boys in the broad-brimmed hats (8)
I believe the answer is:
stetsons
'the broad-brimmed hats' is the definition.
(I've seen this in another clue)
'leave it to mama's boys' is the wordplay.
'leave it' becomes 'stet' (I've seen this in another clue).
'to mama's boys' becomes 'sons' (I've seen this in another clue).
'stet'+'sons'='STETSONS'
'in' is the link.
(Other definitions for stetsons that I've seen before include "Hats for Texans" , "Cowboy hats" , "Hats for Texan oil magnates" .)