The most common and most likely answer to this crossword clue is the 5 letter word CHAIR
I've seen this crossword clue in Independent
C
H
A
I
R
More clues leading to the result CHAIR
- A bit of a laugh with one in credit control meeting
- Companion has manner that goes with professorial position
- Barnet is after Conservative for seat
- Position of professor, one tucking into tea
- See a musical’s MC
- Preside over Church broadcast
- Rocker taking lead in Chicago, the musical?
- Professor could be rocking
- President‘s national barrier
- Church music: where to be seated
Buddy explains!

The straight part
We know that "President/national barrier" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case president/national barrier = chair.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 CHAIR mean?
CHAIR noun- An item of furniture used to sit on or in, comprising a seat, legs, back, and sometimes arm rests, for use by one person. Compare stool, couch, sofa, settee, loveseat and bench.
- The seating position of a particular musician in an orchestra.
- An iron block used on railways to support the rails and secure them to the sleepers, and similar devices.
- One of two possible conformers of cyclohexane rings (the other being boat), shaped roughly like a chair.
- A distinguished professorship at a university.
- A vehicle for one person; either a sedan borne upon poles, or a two-wheeled carriage drawn by one horse; a gig.
- The seat or office of a person in authority, such as a judge or bishop.
- To act as chairperson at; to preside over.
- To carry in a seated position upon one's shoulders, especially in celebration or victory.
- To award a chair to (a winning poet) at a Welsh eisteddfod.
- A chairman or chairwoman, someone who presides over a meeting, board, etc.
- A chair-like device used for performing execution by electrocution.
- An electrically powered wheelchair.
- A transitional hold in which an attacking wrestler hoists an opponent up onto his/her shoulders so that they are both facing in the same direction.