The most common and most likely answer to this crossword clue is the 9 letter word ROLLBACKS
R
O
L
L
B
A
C
K
S
Buddy explains!
The straight part
We know that "Reducing to earlier levels" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case reducing to earlier levels = rollbacks.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 ROLLBACKS mean?
ROLLBACKS noun- A return to a prior state by undoing some operation.
- A withdrawal of military forces.
- An operation which returns a database, or group of records in a database, to a previous state (normally to the previous commit point).
- The situation where a rollercoaster fails to reach the top of a hill and instead rolls backward.
- (mechanics' jargon) A form of flatbed truck adapted or designed specifically as a tow truck or for transporting other vehicles.
- The policy of totally annihilating an enemy's armed forces and occupying the country, as was done in World War II to Italy, Germany, and Japan.