Possible Clues:

• Arab should get a move on, when told this
• "Go faster" command to a horse
• Encouragement to horse to go faster
• Encourage boxer, needing lift, to inject drug repeatedly
• Encourage (horse)
• Faster, horse!
• Certain horse command
• Horse command (2 words)
• Sounds like head of Government is awake and heard at the Curragh regularly
• One thing to say to 20 down to get over the line