As ages reflect I find a weapon (7)
I believe the answer is:
assegai
'a weapon' is the definition.
(assegai is a kind of weapon)
'as ages reflect i' is the wordplay.
'reflect' says the letters should be written in reverse.
'ages' reversed gives 'sega'.
'as'+'sega'+'i'='ASSEGAI'
'find' acts as a link.
(Other definitions for assegai that I've seen before include "African weapon" , "Ages as I threw the spear" , "spear made from wood" , "something pointed" , "Spear used in southern Africa" .)