Juliet pares ragged stone (6)
I believe the answer is:
jasper
'stone' is the definition.
(I've seen this before)
'juliet pares ragged' is the wordplay.
'juliet' becomes 'j' (phonetic alphabet: alpha, bravo, charlie etc.).
'ragged' indicates an anagram.
'pares' is an anagram of 'asper'.
'j'+'asper'='JASPER'
(Other definitions for jasper that I've seen before include "Semi-precious form of quartz" , "Gemstone" , "stone used by jewellers" , "Opaque quartz" , "A man" .)