Shoot a bachelor at midnight! (3)
I believe the answer is:
bag
'shoot' is the definition.
(I've seen this in other clues)
'a bachelor at midnight' is the wordplay.
'a bachelor' becomes 'BA' (the qualification: Bachelor of Arts).
'at' means one lot of letters go next to another.
'midnight' becomes 'g' (the middle letter in 'night').
'ba'+'g'='BAG'
(Other definitions for bag that I've seen before include "interest" , "Claim" , "Carrier" , "Reserve (colloq.)" , "Quantity of game shot in a particular period" .)