Possible Clues:

• Get rich at others' expense
• Take advantage of a situation
• Gather wealth by exploitation ... as hinted at by this puzzle's circled squares?
• Down to secure a certain secluded retreat, and to get richer?
• 12 15 achievement — bird seen to fly on soft wings
• Get rich illicitly
• Profit at another's eggspense
• Appropriate stuff to use down where you live?
• Amply cover own retreat?
• Clean up the seafront, seen in a mess