The most common and most likely answer to this crossword clue is the 8 letter word TREATISE
I've seen this crossword clue in The Daily Telegraph
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R
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A
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More clues leading to the result TREATISE
- Paper ties tear badly
- Study agreements society put forward
- Free entertainment is announced in formal document
- Oddie’s last part after Goodies I included in paper
- Surprise event is had with European paper
- Study agreements head of state promoted
- Study a pose taken up aboard plane, perhaps
- Nurse is given low grade for this dissertation
- Study a model lying back aboard plane?
- Discuss the earliest of explorations around Iceland in a written composition
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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 TREATISE mean?
TREATISE noun- A formal, usually lengthy, systematic discourse on some subject.