The most common and most likely answer to this crossword clue is the 4 letter word DOOR
I've seen this crossword clue in Financial Times
D
O
O
R
More clues leading to the result DOOR
- Opener dropped on one, relieved initially
- Party, alternatively, providing means of escape?
- Flipping staff hanging around old entrance
- Patron removing Northants’ number one – opener
- Party men creating opening
- Quack to keep ducks closer?
- Crucifix is going back for this entrance
- Cross over entrance
- Cross over the threshold
- Learned man carrying ducks is Jim Morrison?
Buddy explains!

The straight part
We know that "Jim Morrison" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case jim morrison = door.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 DOOR mean?
DOOR noun- A portal of entry into a building, room, or vehicle, consisting of a rigid plane movable on a hinge. Doors are frequently made of wood or metal. May have a handle to help open and close, a latch to hold the door closed and a lock that ensures the door cannot be opened without the key.
- Any flap, etc. that opens like a door.
- (immigration) An entry point.
- A means of approach or access.
- A barrier.
- A software mechanism by which a user can interact with a program running remotely on a bulletin board system. See BBS door.
- To cause a collision by opening the door of a vehicle in front of an oncoming cyclist or pedestrian.