Related Clues:

• Telephonist
• Mechanic over each area covering rising rust
• Old phone company worker
• Work on stage 'flipping twaddle' — a plus or a minus?
• A trooper working with engineer
• Frank isn't finished with informer for losing the head with one of those who has your number
• + or -, in math
• Number cruncher?
• Person running a business exercise welcomed by speaker
• Has your number as a local chancer
• One using an item of equipment
• Frank is not finished with informer or chancer
• Wheeler-dealer’s stage performance? Flipping rubbish!
• + or -, to mathematicians
• One who gives talks about parking next to European driver