The most common and most likely answer to this crossword clue is the 7 letter word DECLAIM
I've seen this crossword clue in Financial Times
D
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C
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A
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More clues leading to the result DECLAIM
- Hold forth, initially dismissing extravagant allegation
- Hold forth, disturbing medical
- Brief month left — try to make a protest maybe?
- Inveigh against medical treatment
- Mobile medical spout
- Failed medical brings attack
- Disturbance in medical lecture
- Speak of French island surrounded by shellfish
- Speak aggressively in French of allegation
- Rant of the French about Conservative I am following
Buddy explains!

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 DECLAIM mean?
DECLAIM verb- To object to something vociferously; to rail against in speech.
- To recite, e.g., poetry, in a theatrical way; to speak for rhetorical display; to speak pompously, noisily, or theatrically; bemouth; to make an empty speech; to rehearse trite arguments in debate; to rant.
- To speak rhetorically; to make a formal speech or oration; specifically, to recite a speech, poem, etc., in public as a rhetorical exercise; to practice public speaking.