Sculptor uses this American clobber disguising minute on Queen (9)
I believe the answer is:
alabaster
'sculptor uses this american' is the definition.
Both the definition and answer are adjectives. Maybe you can see an association between them that I don't see?
'clobber disguising minute on queen' is the wordplay.
'clobber' becomes 'baste' ('baste' can be a synonym of 'clobber').
'disguising minute' becomes 'ala' (I can't explain this - if you can you should believe this answer much more).
'on' is a charade indicator (letters next to each other).
'queen' becomes 'r' (r is abbreviation regina. e.g. in ER ).
'baste' put after 'ala' is 'alabaste'.
'alabaste'+'r'='ALABASTER'
Can you help me to learn more?
(Other definitions for alabaster that I've seen before include "that's smooth and white" , "White ornamental stone" , "statuary material?" , "Altar base (anagr.)" , "Altar base (anag)" .)