Sydney radio listeners have been subjected to a racial slur after Alan Jones once again dropped the N-word as part of a foul-mouthed rant.

The veteran broadcaster was discussing the leadership rumblings in Canberra when he turned his attention to outgoing finance minister Mathias Cormann. The 77-year-old said the finance minister needed to reveal his hand.

"Anyone can stand ... but they are mobilising to block Dutton," he said.

"The n----- in the woodpile here, if one can use that expression - and I'm not going to yield to people who tell us that certain words in the language are forbidden - the person who's playing hard to get is Mathias Cormann."