Dairy with cat sculpted to form supporting column (8)
I believe the answer is:
caryatid
'supporting column' is the definition.
(sculpture acting as a column in Greek architecture)
'dairy with cat sculpted' is the wordplay.
'with' means one lot of letters go next to another.
'sculpted' indicates anagramming the letters.
'dairy' after 'cat' is 'catdairy'.
'catdairy' with letters rearranged gives 'CARYATID'.
'to form' acts as a link.
(Other definitions for caryatid that I've seen before include "Pillar in female form" , "supporting woman that's stony" , "Column in shape of woman" , "Column in female form" , "Sculptured female figure as support pillar" .)