Possible Clues:

• 'There's money in the cultivation of this (2,3,4)'
• Where there's money, he lit up
• There's money where he lit up
• Where it could be lithe, there's money there
• Where there ought to be money - the lithe mixture
• You'll have to 1 across if there's only, perhaps, one pound there
• Where there's money - one pound, anyway
• Is one pound all that you have there?