The most common and most likely answer to this crossword clue is the 10 letter word BACKSLIDES
I've seen this crossword clue in The Times
B
A
C
K
S
L
I
D
E
S
More clues leading to the result BACKSLIDES
Buddy explains!

The straight part
We know that "lapses" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case lapses = backslides.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 BACKSLIDES mean?
BACKSLIDES noun- A backward regression; a reverting back to a worse state.
- A dance move in which the feet are alternately slid back and the heels lifted, giving the illusion of walking forwards while actually moving backwards; later popularly called the moonwalk.
- To regress; to slip backwards or revert to a previous, worse state.
- To shirk responsibility; to renege on one's obligations or commitments.