The most common and most likely answer to this crossword clue is the 10 letter word BOOTLICKER
I've seen this crossword clue in Independent
B
O
O
T
L
I
C
K
E
R
More clues leading to the result BOOTLICKER
Buddy explains!
The straight part
We know that "servile flatterer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case servile flatterer = bootlicker.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 BOOTLICKER mean?
BOOTLICKER noun- A person who behaves in a servile or obsequious manner; a toady
- Anyone who is seen as supporting authoritarianism.