Post topical piece in newspaper (6)

I believe the answer is:

column

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'post' is the definition.
(I've seen this before)

I cannot understand how the rest of the clue works.

(Other definitions for column that I've seen before include "Vertical newspaper unit" , "Round pillar or newspaper article" , "Trajan's or Nelson's" , "Body of troops" , "Newspaper article giving an opinion" .)

I've seen this clue in The Telegraph.

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