Old house makes a lot of money (4)
I believe the answer is:
pile
This clue might be a double definition.
'old house' is the first definition.
'pile' can be an answer for 'house' (thesaurus). I'm not sure about the 'old' bit.
'a lot of money' is the second definition.
(I've seen this before)
'makes' acts as a link.
Can you help me to learn more?
(Other definitions for pile that I've seen before include "supporting column" , "Fortune" , "large building" , "lot of money" , "Arrange in stacks" .)