Possible Clues:

• Arabica, for example
• Source of stimulation (not instant!)
• Drink for old comic? Short - a type of bourbon popular with those on the ground!
• Bit ground by a barista
• Heard worker keeps one awake opening new ground before adding water for consumers
• Bit ground at Starbucks
• Part of the morning grind?
• It's ground beef no caf¿ cooked
• In cafe, no beef, unfortunately: this, though?
• Robusta, Arabica are varieties of this seed