The most common and most likely answer to this crossword clue is the 6 letter word COLUMN
I've seen this crossword clue in The Guardian
C
O
L
U
M
N
More clues leading to the result COLUMN
- Something one might read in The Post?
- Newspaper feature generates support
- Architectural construction is a newspaper feature
- Post regular feature by a correspondant
- Nelson tops one detachment of servicemen
- Body of troops, one in Trafalgar?
- Not a row of collaborators as fifth regular feature
- Post topical piece in newspaper
- Upright army officer regularly selected gunmen
- Not in favour of accepting piece cut in newspaper article
Buddy explains!

The straight part
We know that "Not a row/collaborators as fifth/regular feature" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not a row/collaborators as fifth/regular feature = column.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does COLUMN mean?
COLUMN noun- A solid upright structure designed usually to support a larger structure above it, such as a roof or horizontal beam, but sometimes for decoration.
- A vertical line of entries in a table, usually read from top to bottom.
- A body of troops or army vehicles, usually strung out along a road.
- A body of text meant to be read line by line, especially in printed material that has multiple adjacent such on a single page.
- A unit of width, especially of advertisements, in a periodical, equivalent to the width of a usual column of text.
- (by extension) A recurring feature in a periodical, especially an opinion piece, especially by a single author or small rotating group of authors, or on a single theme.
- Something having similar vertical form or structure to the things mentioned above, such as a spinal column.
- The gynostemium
- (chemistry) An object used to separate the different components of a liquid or to purify chemical compounds.