Possible Clues:

• Process, as cereal
• Given no end of trouble, figures it's hard to process grain
• Beet report for farm work
• To separate grain from husks and straw
• Harvesters may do this run in the small hours
• Separate the seeds from
• Do some farmwork
• Separate grain from (corn); move violently
• What 17 down will do for work on farm
• Work on farm offering most of the rest with head-start