Related Clues:

• One receiving many calls at work
• User of machinery
• Tour manager with Carmen is upset going to rack and ruin
• Glyndebourne company's trip putting off posh conductor?
• 'Smooth ___' (Sade hit)
• Driver for pointless proportionate representation
• Artwork flipping rubbish, which may be a minus
• Local wheeler-dealer or a trooper on the rampage
• Person using drill interrupts speaker
• Person running business peeled waterproof off
• Switchboard pro
• One who makes connections on a telephone switchboard
• One who talks about exercising person in exchange
• Plus or minus sign, say
• Speaker welcoming physical exercise as runner