The most common and most likely answer to this crossword clue is the 6 letter word HEARTS
I've seen this crossword clue in Financial Times
H
E
A
R
T
S
More clues leading to the result HEARTS
- One suit makes a Scottish outfit
- English county filing a suit
- Team tries tackling tenaciously at the outset
- Spirit shown by Sweden’s top football team
- King in races – King and twelve others?
- Beasts devouring last of creature’s vital organs
- Suit – Scottish footballing outfit?
- Receives information about Turkey’s earliest football club
- Club suit? Yes and no
- Pick up Eliot’s suit
Buddy explains!

The straight part
We know that "King and twelve others" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case king and twelve others = hearts.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 HEARTS mean?
HEARTS noun- A muscular organ that pumps blood through the body, traditionally thought to be the seat of emotion.
- Emotions, kindness, moral effort, or spirit in general.
- The seat of the affections or sensibilities, collectively or separately, as love, hate, joy, grief, courage, etc.; rarely, the seat of the understanding or will; usually in a good sense; personality.
- Courage; courageous purpose; spirit.
- Vigorous and efficient activity; power of fertile production; condition of the soil, whether good or bad.
- A term of affectionate or kindly and familiar address.
- Personality, disposition.
- A wight or being.
- A conventional shape or symbol used to represent the heart, love, or emotion: ♥ or sometimes <3.
- A playing card of the suit hearts featuring one or more heart-shaped symbols.
- The twenty-fourth Lenormand card.
- The centre, essence, or core.
- To be fond of. Often bracketed or abbreviated with a heart symbol.
- To give heart to; to hearten; to encourage.
- To fill an interior with rubble, as a wall or a breakwater.
- To form a dense cluster of leaves, a heart, especially of lettuce or cabbage.
- One of the four suits of playing cards, in red, marked with the symbol ♥.
- A trick-taking card game in which players are penalized for taking hearts and (especially) the queen of spades.