The most common and most likely answer to this crossword clue is the 8 letter word DEMURRER
I've seen this crossword clue in Financial Times
D
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Buddy explains!
The straight part
We know that "legal objection" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case legal objection = demurrer.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 DEMURRER mean?
DEMURRER noun- A motion by a party to an action, for the immediate or summary judgment of the court on the question, whether, assuming the truth of the matter alleged by the opposite party, it is sufficient in law to sustain the action or defense, and hence whether the party resting is bound to answer or proceed further.
- Someone who demurs.