Possible Clues:

• I see, with a patent like this, one cannot be 4 across
• There's very little PM can somehow change ultimately
• Trading floor beat church's meagre pay
• Tiny allowance
• It can't get into so little money
• Peanuts and bread - oddly niche
• Chickenfeed
• A cent tip (anag.)
• PM once introducing article for nothing — or very little
• Tiny amount