The most common and most likely answer to this crossword clue is the 9 plus 1 letter word MACAROON} –
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Buddy explains!
The straight part
We know that "biscuit" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case biscuit = macaroon} –.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 MACAROON} – mean?
MACAROON} – noun- Any of various pastries based on almond and egg white, traditionally made in France.
- A soft biscuit or cookie prepared with almond or coconut dough.
- A coarse, rude, low fellow.