The most common and most likely answer to this crossword clue is the 7 letter word THEREIN
T
H
E
R
E
I
N
More clues leading to the result THEREIN
- Money divided by male soldiers in that place
- Neither can move in that place
- Metal used for foil when wrapping present in it
- Article with strap in it
- Take this to fill can in that
- Inside that’s eerie, oddly fine outside
- Neither liquid could be contained by that
- Electronic instrument lacking mains lead in it
- Present wrapped in metal — where is it?
- The control in that place
Buddy explains!

The straight part
We know that "in it" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case in it = therein.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 THEREIN mean?
THEREIN adverb- (pronominal) in that; in him/her/it