Sentence examples for a dirty from inspiring English sources

The answer depends on the context in which you are using the phrase.
"A dirty" is not technically a complete sentence, and so it could not stand on its own. However, it could be used as part of a larger sentence, such as, "The riverbank was littered with a dirty collection of broken glass and other debris." In this example, the phrase "a dirty" modifies the word "collection," describing it as unclean or filthy.