Possible Clues:

• Yellow flower
• Shade of yellow
• Meadow flower
• Common yellow flower
• Yellow wildflower
• There's blooming little of this in H.M.S. Pinafore
• Bright yellow flowers spread on winner's trophy
• Common meadow flower
• A flower that's yellow and black, say, is given a prize
• Foremost of botanists, say, presented with prize flower