The phrase "a one off role" is correct and usable in written English.
It can be used to describe a position or job that is not intended to be permanent or recurring, often for a specific event or project.
Example: "She was hired for a one off role in the upcoming film, which will not lead to any further commitments."
Alternatives: "a temporary position" or "a one-time role".
Minogue officially registered her interest on 26 March 2007 and was subsequently given a one-off role as the Doctor's companion.
In 1930, Lombard returned to Fox for a one-off role in the western The Arizona Kid.
He was rarely out of work and soon in demand on television, too, taking one-off roles in series such as The Adventures of Superman (1953) and Gun Law (1955) before a run as the college student Brian McAfee in The George Burns and Gracie Allen Show (1957-58).
Over the show's history, it featured a number of notable comic actors in one-off roles.
He popped up in one-off roles in The New Avengers (1977) and the sitcom Marjorie and Men (1985).
Many one-off roles followed in series such as Bless This House (1971), Love Thy Neighbour (1972), Man About the House (1974), It Ain't Half Hot Mum (1981) and Hi-de-Hi!
After leaving The Bill he had one-off roles in Holby City (2004), Heartbeat (2007), Doctors (two parts, 2007, 2009), Casualty (2010) and Midsomer Murders (2011), and appeared alongside Robert Carlyle in the 2008 film Summer.
Before he began this contract, he played his first speaking role on film: a one-off section in The Show of Shows (1929), playing Richard, Duke of Gloucester in Henry VI, Part 3. His first two films under contract were General Crack and The Man from Blankley's, each of which were modestly successful.
It all began when Kirkbride, who had been an actress and assistant stage manager at Oldham Rep, landed a role in a one-off Granada TV comedy-drama in 1972.
This doesn't mean a lady is unprepared to play the penetrative role in a one-off Japanese rendezvous.
This was her first major role, following a one-off appearance in a 2010 episode of "How I Met Your Mother". 3. Fantasia Barrino (2004).
