Possible Clues:

• Extract grain (with flail)
• Get the grain
• Separate grains from hulls
• The way to make it so seedy is to cut out the chaff
• Cast ultimately drowned out by quiet beat
• Just cut out the chaff and beat it
• Work with the grain
• Triplets mostly quiet toss and turn
• Separate the wheat from the chaff?
• Process (cereals) to separate chaff from grain