Most prim actress hit drunk (10)

I believe the answer is:

starchiest

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'most prim' is the definition.
Both the definition and answer are superlative adjectives. Perhaps there's an association between them I don't understand?

'actress hit drunk' is the wordplay.
'drunk' indicates anagramming the letters.
'actress'+'hit'='actresshit'
'actresshit' is an anagram of 'STARCHIEST'.

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