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 "Small drink; photograph", "Fired - attempt", "Photo; small drink", "Lead pellet", "Goal attempt", "Sent a bullet", "Charge", "Short drink; attempt", "Photo; lead pellets" and "Photo; try".)