The most common and most likely answer to this crossword clue is the 10 letter word MISSIONARY
I've seen this crossword clue in Independent
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More clues leading to the result MISSIONARY
Buddy explains!

The straight part
We know that "Such a position for the other" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case such a position for the other = missionary.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 MISSIONARY mean?
MISSIONARY noun- One who is sent on a mission.
- A person who travels attempting to spread a religion or a creed.
- A religious messenger.
- The missionary position for sexual intercourse.
- Relating to a (religious) mission