Possible Clues:

• Cheese is said to produce wind
• It takes only a little blow to make the blocks
• Kind of block that's an easy task to move?
• Snap
• Something very easy to do (colloq.)
• Piece of cake giving you wind
• Doddle - light wind
• It comes in through the open window - easy peasy!
• Given piece of cake, is this enough to blow out candles?
• A light pleasant wind