6 down
3
makes
a
killing
after
receiving
a
tip
(3,3)
3 makes a killing after receiving a tip (3,3)
hints
0
checks
0
hints
The definition is at the beginning of the clue.
How the clue works
The 3 is a cross-reference to 3 down (HORSE), and Red Rum was one of the most famous racehorses. Take MURDER for 'makes a killing' and turn it upside down, as signalled by 'receiving a tip' meaning upended, to give REDRUM.