Related Clues:

• Doctor, I just go on and on
• A bee's purpose: to carry the gold back
• Roger exhausted without being an idler
• Idler: one needs a doctor
• Medico (single) - a lazy individual
• When order is reversed to produce a low hum
• One that owes one is no worker
• Male honey bee - hum
• He buzzes, but not with energy!
• Male bee - monotonous hum
• Monotonous sound - member of hive
• Sustained bass note accompanying a melody - male bee
• Queen's attendant doctor and I
• Unmanned flier
• Male wasp