A pillar of the press? (6)

I believe the answer is:

column

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'a pillar' is the definition.
(I know that pillar can be written as column)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for column that I've seen before include "Round pillar or troops formation" , "in paper" , "Vertical newspaper unit" , "stack" , "Linear display, of numbers say" .)

I've seen this clue in The Irish Independent.

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