Nurse and I let loose, getting dirty (9)

I believe the answer is:

unsterile

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'dirty' is the definition.
Both the definition and answer are adjectives.
Maybe you can see a link between them that I don't see?

'nurse and i let loose' is the wordplay.
'and' means one lot of letters go next to another.
'loose' is an anagram indicator (letters are loosened from their original positions).
'nurse'+'i'+'let'='nurseilet'
'nurseilet' is an anagram of 'UNSTERILE'.

'getting' acts as a link.

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