Possible Clues:

• One pulled to fire
• He ran under Rogers
• Cause (device) to operate
• Buttermilk's stablemate
• There's firing for the Press with this
• One would try to get around the horse to make it go off
• May go off if one has one's finger on one
• Set off to get goods in city abroad
• It's a matter of fingering to be one that tries to get around a horse
• Gun firing device