The most common and most likely answer to this crossword clue is the 6 letter word CASTLE
I've seen this crossword clue in The Guardian
C
A
S
T
L
E
More clues leading to the result CASTLE
- Chess piece lieutenant put back in box
- Playing piece has all the actors leave gutted
- Fortified stronghold and lake in order
- Class invaded by large rook
- Chess piece left in class
- Social group welcomes Liberal in Leeds, say?
- Rook — mouldy thing with loathsome wings
- Man cornered in fortress?
- Keep players on leg-side boundaries
- Bluebeard’s home neat? Yes, finally, for the first time
Buddy explains!
The straight part
We know that "Keep" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case keep = castle.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 CASTLE mean?
CASTLE noun- A large building that is fortified and contains many defences; in previous ages often inhabited by a nobleman or king.
- An instance of castling.
- A rook; a chess piece shaped like a castle tower.
- A defense structure in shogi formed by defensive pieces surrounding the king.
- A close helmet.
- Any strong, imposing, and stately mansion.
- A small tower, as on a ship, or an elephant's back.
- The wicket.
- To house or keep in a castle.
- To protect or separate in a similar way.
- To make into a castle: to build in the form of a castle or add (real or imitation) battlements to an existing building.
- (usually intransitive) To move the king 2 squares right or left and, in the same turn, the nearest rook to the far side of the king. The move now has special rules: the king cannot be in, go through, or end in check; the squares between the king and rook must be vacant; and neither piece may have been moved before castling.
- (usually intransitive) To create a similar defensive position in Japanese chess through several moves.
- To bowl a batsman with a full-length ball or yorker such that the stumps are knocked over.