The most common and most likely answer to this crossword clue is the 10 letter word TUT-TUTTED
I've seen this crossword clue in Financial Times
T
U
T
-
T
U
T
T
E
D
Buddy explains!
The straight part
We know that "expressed disapproval" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case expressed disapproval = tut-tutted.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 TUT-TUTTED mean?
TUT-TUTTED verb- To express such a sound, especially as a mild reproof