Weapon brand seeing investment by Prince (5)
I believe the answer is:
spear
'weapon' is the definition.
(spear is a kind of weapon)
'brand seeing investment by prince' is the wordplay.
'brand' becomes 'sear' (both can mean to burn).
'seeing investment by' indicates putting letters inside (invest can mean to insert or put in).
'prince' becomes 'p'.
'sear' placed around 'p' is 'SPEAR'.
(Other definitions for spear that I've seen before include "Impale" , "Sharp weapon" , "Asparagus shoot" , "Lance" , "Sharp-tipped weapon" .)