Column's parts lie in ruins (8)
I believe the answer is:
pilaster
'column's' is the definition.
(pilaster is a kind of column)
'parts lie in ruins' is the wordplay.
'in ruins' indicates anagramming the letters.
'parts'+'lie'='partslie'
'partslie' is an anagram of 'PILASTER'.
(Other definitions for pilaster that I've seen before include "Piles tar into a form of column" , "Decorative column standing out from the fa?ade of a building" , "Rectangular column support projecting slightly from a wall" , "Square column" , "Rectangular column projected from wall" .)