The most common and most likely answer to this crossword clue is the 5 letter word ENTRY
I've seen this crossword clue in Independent
E
N
T
R
Y
Buddy explains!
The straight part
We know that "door" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case door = entry .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 ENTRY mean?
ENTRY noun- The act of entering.
- Permission to enter.
- A doorway that provides a means of entering a building.
- The act of taking possession.
- The start of an insurance contract.
- A passageway between terraced houses that provides a means of entering a back garden or yard.
- A small room immediately inside the front door of a house or other building, often having an access to a stairway and leading on to other rooms
- A small group formed within a church, especially Episcopal, for simple dinner and fellowship, and to help facilitate new friendships
- An item in a list, such as an article in a dictionary or encyclopedia.
- A record made in a log, diary or anything similarly organized; a datum in a database.
- A term at any position in a matrix.
- The exhibition or depositing of a ship's papers at the customhouse, to procure licence to land goods; or the giving an account of a ship's cargo to the officer of the customs, and obtaining his permission to land the goods.
- The point when a musician starts to play or sing; entrance.