Son given very warm drink (4)
I believe the answer is:
Here is my best explanation:
'drink' is the definition.
'son given very warm' is the subsidiary indication.
'son' becomes 's'.
'given' is a charade indicator (letters next to each other).
'very warm' becomes 'hot' (I've seen this before).
(Other definitions for shot that I've seen before include "Crack", "Short drink; attempt", "Fired from a weapon", "Small drink of liquor", "Fired or filmed", "Used a gun", "Fired - pellet", "Small drink; photograph", "Ruined; photograph" and "Small drink; (rocket) launch".)