The most common and most likely answer to this crossword clue is the 9 letter word RECUMBENT
I've seen this crossword clue in Financial Times
R
E
C
U
M
B
E
N
T
More clues leading to the result RECUMBENT
- Laid back vicar maybe dropping in on his class?
- Flat hire charge includes copper gong
- Lying boss almost in late
- Lying about person in office not getting elected
- Lying bum flogged modern houses
- Lying about boss, nearly new
- Lying about source of money pocketed by copper
- Socially acceptable doctor involved in fresh lying
- Lying about joining with criminal
- Posh doctor living in modern flat
Buddy explains!

The straight part
We know that "Lying" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lying = recumbent.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 RECUMBENT mean?
RECUMBENT noun- A bicycle or tricycle that places the rider in a reclined posture.
- Lying down.
- Inactive; idle.