Bayonet in male side (5)
I believe the answer is:
spear
I believe this clue is a double definition.
'bayonet' is the first definition.
(thesaurus)
'male side' is the second definition.
('spear side' is the male side of a family)
'in' is the link.
(Other definitions for spear that I've seen before include "pierce with this?" , "Weapon to throw" , "Old weapon" , "mint may be added" , "Simple weapon" .)