The most common and most likely answer to this crossword clue is the 8 letter word OBJECTED
I've seen this crossword clue in The Guardian
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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 = objected.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 OBJECTED mean?
OBJECTED verb- To disagree with or oppose something or someone; (especially in a Court of Law) to raise an objection.
- To offer in opposition as a criminal charge or by way of accusation or reproach; to adduce as an objection or adverse reason.
- To set before or against; to bring into opposition; to oppose.