2. Noun. Someone with no prior criminal record, a person with no previous convictions; loosely, someone who has not done anything wrong before, an unblemished character. ¹
3. Noun. (Australia NZ) An unlabelled bottle of wine. ¹
4. Noun. An undercover police officer who has not done a particular task before. ¹
5. Noun. (cricket) A cricket bat with no maker's logo ¹
¹ Source: wiktionary.com