Point secured in contest, throwing weapon (5)
I believe the answer is:
spear
'throwing weapon' is the definition.
(weapon which is thrown)
'point secured in contest' is the wordplay.
'point' becomes 'E' (compass point).
'secured in' is an insertion indicator.
'contest' becomes 'spar' (I am not sure about this - if you are sure you should believe this answer much more).
'e' placed into 'spar' is 'SPEAR'.
Can you help me to learn more?
(Other definitions for spear that I've seen before include "Thrown weapon" , "A bit of asparagus" , "stick" , "Asparagus shoot" , "Simple weapon" .)