The most common and most likely answer to this crossword clue is the 6 letter word STAIRS
I've seen this crossword clue in The Sunday Telegraph
S
T
A
I
R
S
More clues leading to the result STAIRS
- Steps laid down by good person with self-importance
- One among heavenly bodies in flight
- Flight of fruit from the East End?
- Flight looks hard, they say
- Series of steps looks hard to an audience
- One’s interstellar flight
- Goggles, we hear, for flight
- Flight of celebrities across north of Italy
- One amongst celebrities in flight
- Flight in last airship
Buddy explains!

The straight part
We know that "Flight" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case flight = stairs.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 STAIRS mean?
STAIRS noun- A single step in a staircase.
- A series of steps; a staircase.
- A contiguous set of steps connecting two floors.