The most common and most likely answer to this crossword clue is the 8 letter word BEDEGUAR
B
E
D
E
G
U
A
R
Buddy explains!
The straight part
We know that "Abnormal growth" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case abnormal growth = bedeguar.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 BEDEGUAR mean?
BEDEGUAR noun- A gall produced on rosebushes, especially on the sweetbrier or eglantine, by a puncture from the ovipositor of a gallfly (Diplolepis rosae), and once supposed to have medicinal properties.