The most common and most likely answer to this crossword clue is the 9 letter word VARIABLES
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More clues leading to the result VARIABLES
Buddy explains!
The straight part
We know that "they keep changing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they keep changing = variables.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 VARIABLES mean?
VARIABLES noun- Something that is variable.
- Something whose value may be dictated or discovered.
- A quantity that may assume any one of a set of values.
- A symbol representing a variable.
- A named memory location in which a program can store intermediate results and from which it can read them.
- A variable star.
- A shifting wind, or one that varies in force.
- (in the plural) Those parts of the sea where a steady wind is not expected, especially the parts between the trade-wind belts.