Footie tournament with investment of bank: make killing (5,2)

I believe the answer is:
clean up
'make killing' is the definition.
'clean up' can be an answer for 'make' (thesaurus). I am not sure about the 'killing' bit.
'footie tournament with investment of bank' is the wordplay.
I cannot really see how this works, but
'bank' could be 'lean' (bank can mean to lean or tilt) and 'lean' is found in the answer.
'tournament' could be 'cup' (eg the World Cup) and 'cup' is found in the remaining letters.
No letters remain.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for clean up that I've seen before include "Make a lot of money" , "Make a substantial profit" , "emulate Bowdler" , "Win everything!" , "Make a bundle" .)
