Lot of money, mine (4)
I believe the answer is:
bomb
I believe this is a double definition.
'lot of money' is the first definition.
(I've seen this before)
'mine' is the second definition.
(I've seen this before)
(Other definitions for bomb that I've seen before include "lot of money" , "Exploding weapon" , "Flop - load of money" , "packet" , "Drop" .)