The most common and most likely answer to this crossword clue is the 2 plus 5 letter word IN DEPTH
I
N
D
E
P
T
H
More clues leading to the result IN DEPTH
- Thoroughly cack-handed husband getting around DIY at first
- Home Office branch last to refurbish fully
- Thoroughgoing Democrat interrupts useless husband
- Sort of investigation made by bathyscape?
- Comprehensive‘s useless having taken on daughter and husband
- Thoroughly fashionable wisdom
- Thoroughly awkward about daughter and husband
- Pint he’d drunk at length
- Thoroughly at home with department before end of month
- Thoroughly describing diver’s place of work?
Buddy explains!

The straight part
We know that "Thoroughly" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case thoroughly = in depth.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 DEPTH mean?
IN DEPTH adjective- Thorough; comprehensive.