The most common and most likely answer to this crossword clue is the 9 letter word FINE-TUNE
F
I
N
E
-
T
U
N
E
More clues leading to the result FINE-TUNE
Buddy explains!
The straight part
We know that "Adjust" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case adjust = fine-tune.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 FINE-TUNE mean?
FINE-TUNE verb- To make small adjustments to (something) until it is optimal.