The most common and most likely answer to this crossword clue is the 5 letter word ROTAS
R
O
T
A
S
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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 ROTAS mean?
ROTAS noun- A schedule that allocates some task, responsibility or (rarely) privilege between a set of people according to a (possibly periodic) calendar.
- A kind of zither, played like a guitar, used in the Middle Ages in church music.