The most common and most likely answer to this crossword clue is the 8 letter word PERUSING
P
E
R
U
S
I
N
G
Buddy explains!

The straight part
We know that "Studying" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case studying = perusing.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 PERUSING mean?
PERUSING verb- To examine or consider with care.
- To read completely.
- To look over casually; to skim.
- To go from place to place; to wander.
- A process of studying something carefully.