The most common and most likely answer to this crossword clue is the 8 letter word BOOKWORM
I've seen this crossword clue in The Times
B
O
O
K
W
O
R
M
More clues leading to the result BOOKWORM
- A Reading fan?
- Diligent student’s grub
- Man who’s learned caution: leader of mob holding bank up
- Philistine drinks fine wine for a start, then takes motorway grub
- One keen on reading new work in progress rapidly
- A voracious reader
- Avid reader of Bellow getting over work being rewritten
- Devourer of knowledge
- Reserve mechanical device for academic
- Report new work’s in for keen reader
Buddy explains!

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 BOOKWORM mean?
BOOKWORM noun- Any of various insects that infest books.
- An avid book reader.