Discharged saint with passion (4)
I believe the answer is:
shot
'discharged' is the definition.
(shooting is a kind of discharging)
'saint with passion' is the wordplay.
'saint' becomes 's'.
'with' says to put letters next to each other.
'passion' becomes 'hot' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
's'+'hot'='SHOT'
Can you help me to learn more?
(Other definitions for shot that I've seen before include "Charge" , "Ruined; photograph" , "injured or killed?" , "Small drink; (rocket) launch" , "Discharged a weapon" .)