The phrase "a former reality" is correct and usable in written English.
It can be used to describe a situation or state of affairs that once existed but is no longer the case.
Example: "The world we live in today is vastly different from a former reality where technology was not as advanced."
Alternatives: "a past reality" or "an earlier reality".
"It doesn't get more real than this," said Mr. Scott, a former reality TV contestant on "Top Chef".
The freshman class includes a former reality show star and champion lumberjack (Sean Duffy of Wisconsin) and Kristi Noem, a cattle rancher and mother from South Dakota.
Meanwhile, the primaries are looking increasingly like a reality show, and the guy leading the Republican pack is a former reality star himself.
The player previously won an anonymised gagging order about his alleged affair with a former reality TV star and glamour model Imogen Thomas.
This place runs into trouble with women on a regular basis, most memorably in recent years when the C.E.O. of Hewlett-Packard resigned after inappropriate conduct with a former reality TV actress who was working for him.
They seemed headed for a final until the weekend, when Trump, a former reality TV star and a master of suspense, unveiled a new season with a fresh cast of characters.
As a former reality-TV star, Donald Trump knows the importance of having a good set.
Siwa, a former reality-TV star, is now a vlogger who makes pop music and has her own line of hair bows.
In November, shortly after the host of "The Apprentice" was elected President, the troubled starlet Tila Tequila herself a former reality-TV star, one whose life had become a sad train wreck blinked back onto the gossip radar.
Omarosa Manigault, a former reality-show villain and now a communications staffer, glared at reporters while whispering to a colleague; she covered her mouth with a notepad, trying to prevent leaks via lip-reading.
