The most common and most likely answer to this crossword clue is the 2 plus 4 letter word IN SITU
I've seen this crossword clue in The Guardian
I
N
S
I
T
U
More clues leading to the result IN SITU
- Some coins I turned and placed
- Correctly positioned current units on manoeuvres
- Unmoved by fashionable tailored suit
- Appropriately placed university not very funny
- Unit is possibly Roman, naturally placed
- Unmoved by reins, it understood a bit
- Does logical thing with pin-up after cutting margins to get correctly positioned
- Partly explains it, untouched and unmoved
- Protest the wrong way round? Union not spreading
- Putin is unfortunate to lose power in position
Buddy explains!

The straight part
We know that "Unmoved" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unmoved = in situ.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 IN SITU mean?
IN SITU adjective- In its original position or place