The most common and most likely answer to this crossword clue is the 6 letter word RUMMER
R
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M
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More clues leading to the result RUMMER
Buddy explains!

The straight part
We know that "rather odd" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rather odd = rummer.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 RUMMER mean?
RUMMER noun- A large drinking-glass studded with prunts to ensure a safe grip, popular in the Rhineland and the Netherlands from the 15th century to the 17th century.
- Fine, excellent, valuable.
- Strange, peculiar.