Possible Clues:

• Hand drum
• Quality of sound initially leaves one shaken
• Sound quality: pound, shake this
• Barman calls over brother on left with instrument
• One shaken and weary at length calling doctor in
• Medic disturbing weary trainee with bit of percussion
• With a distinctive sound, pound old instrument
• Boy's brother associated with the Spanish tambourine
• Biblical percussion instrument
• Sound quality left instrument