A floor covering contains black and white (6)
I believe the answer is:
albino
'white' is the definition.
(thesaurus)
'a floor covering contains black' is the wordplay.
'floor covering' becomes 'lino' (short for linoleum).
'contains' means one lot of letters goes inside another.
'black' becomes 'b' (as in pencil classifications).
'lino' placed around 'b' is 'lbino'.
'a'+'lbino'='ALBINO'
'and' acts as a link.
(Other definitions for albino that I've seen before include "Person or animal lacking natural pigments" , "No bail for one lacking colour pigment" , "Feel" , "Person lacking pigment" , "Animal with pigment deficiency" .)