The most common and most likely answer to this crossword clue is the 11 letter word ANOMALOUSLY
I've seen this crossword clue in Financial Times
A
N
O
M
A
L
O
U
S
L
Y
Buddy explains!
The straight part
We know that "in an odd way" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in an odd way = anomalously.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.