The most common and most likely answer to this crossword clue is the 9 letter word TRUNCATES
I've seen this crossword clue in The Times
T
R
U
N
C
A
T
E
S
More clues leading to the result TRUNCATES
Buddy explains!
The straight part
We know that "docks" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case docks = truncates.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 TRUNCATES mean?
TRUNCATES verb- To shorten (something) by, or as if by, cutting part of it off.
- To shorten (a decimal number) by removing trailing (or leading) digits.
- To replace a corner by a plane (or to make a similar change to a crystal).