Stability shown by graduate with weapon (7)
I believe the answer is:
balance
'stability' is the definition.
(I've seen this before)
'graduate with weapon' is the wordplay.
'graduate' becomes 'ba'.
'with' is a charade indicator (letters next to each other).
'weapon' becomes 'lance' (lance is a kind of weapon).
'ba'+'lance'='BALANCE'
'shown by' is the link.
(Other definitions for balance that I've seen before include "State of equilibrium" , "Libra - amount in account" , "the unstable may lose before fall" , "Surplus" , "Equilibrium or symmetry" .)