Has a capital piece published here regularly (6)

I believe the answer is:

column

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'has a capital piece published here regularly' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

This is all the clue.

Can you help me to learn more?

(Other definitions for column that I've seen before include "Convulsive muscular contraction" , "Trajan's or Nelson's" , "Nelson's pillar" , "Tall cylindrical vertical upright" , "stack" .)

I've seen this clue in The Irish Times.

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