The most common and most likely answer to this crossword clue is the 7 letter word REFORMS
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More clues leading to the result REFORMS
Buddy explains!

The straight part
We know that "Changes" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case changes = reforms.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 REFORMS mean?
REFORMS noun- The change of something that is defective, broken, inefficient or otherwise negative, in order to correct or improve it
- To put into a new and improved form or condition; to restore to a former good state, or bring from bad to good; to change from worse to better
- To return to a good state; to amend or correct one's own character or habits
- To form again or in a new configuration.