Worthless arrangement of bald pieces (10)
I believe the answer is:
despicable
'worthless' is the definition.
(thesaurus)
'arrangement of bald pieces' is the wordplay.
'arrangement of' indicates anagramming the letters.
'bald'+'pieces'='baldpieces'
'baldpieces' is an anagram of 'DESPICABLE'.
(Other definitions for despicable that I've seen before include "rotten" , "bum" , "Mean" , "Vile" .)