Pillar or support (6)
I believe the answer is:
column
I believe this is a double definition.
'pillar' is the first definition.
(synonyms)
'support' is the second definition.
(column is a kind of support)
(Other definitions for column that I've seen before include "Pillar - newspaper section" , "Vertical structure" , "in paper" , "Nelson's pillar" , "Vertical division of page" .)