The most common and most likely answer to this crossword clue is the 3 plus 4 letter word LIE DOWN
I've seen this crossword clue in The Daily Telegraph
L
I
E
D
O
W
N
More clues leading to the result LIE DOWN
- Story sad, drop to the floor
- Having told a story, have to rest
- Song needing to have repose
- After story daughter to have short rest
- ‘A Song for Europe’? Have to go to bed!
- Inaccuracy with ‘vertical’ crossword clue – get ‘horizontal‘
- Accept without protest and remain in adversity
- Rest of song personal
- Invention not working? You need to relax
- Rest of old wine gets drunk
Buddy explains!

The straight part
We know that "this" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case this = lie down.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 LIE DOWN mean?
LIE DOWN noun- A short period of rest while lying.