Related Clues:

• Informant starts to supply tip-off in time spent on phone
• One who informs a referee?
• Exposer of bad things -- one telling us the game's over?
• Tell-tale phone call coming earlier
• Trump's game upset insurgent concealing mean person exposing wrongdoing
• Canary below cuckoo captured by artist
• One who exposes wrongdoing
• One gives inside info of Cockney three-piece on phone
• Employee who calls out bad practices, say
• Person who reveals corruption in a company or state
• Informer, one stopping game?
• Referee (one hoping to ensure the game is up?)