The phrase "a less than clean" is correct and usable in written English.
It can be used to describe something that is not completely clean or is somewhat dirty, often in a figurative sense.
Example: "The kitchen was a less than clean environment for preparing food, with crumbs scattered everywhere."
Alternatives: "not entirely clean" or "somewhat dirty".
And subsequently they didn't assist me with cleaning up properly, which left me in a less than clean or desirable position.
There are more than one kind of secret agent, so if you have a less than clean record but a good set of espionage skills, you might consider getting into corporate espionage, working for a large corporation to spy on other corporations and report back.
One of the misses came on a less-than-clean snap...
It took more than half an hour to get through security, and once I got to the overcrowded gate — after a stop in a less-than-clean bathroom — the cacophony of competing announcements, a blaring television and a passenger's music player blasting without headphones was deafening, especially at 9 a.m.
The public disclosure and campaign finance laws here, which stemmed from concerns about a less-than-squeaky-clean system in the 1960's and 70's, allow the public to trace donations to donors.
There are far more realistic deflections, less-than clean rebounds and more.
Got a less than squeaky-clean medical history, numerous past claims or just plain old age?
Authors have the right to a less than squeaky-clean hero, but critics chastise Istvan for not whitewashing his brain to give them one.
If I wanted to visit a run-down, tired-looking, less-than-clean place with appliances I'd visit my own kitchen.
He took a big step on the landing, but having a 7.0 start value cushioned some of the penalty from the less-than-clean landing.
Last week, I stumbled upon some of the oldest evidence for slang's less-than-clean-cut past.
