The most common and most likely answer to this crossword clue is the 6 letter word GRAINY
I've seen this crossword clue in The Daily Telegraph
G
R
A
I
N
Y
More clues leading to the result GRAINY
- Old still can be this good, but not fine
- Coarse fish nets in Grangemouth first
- Fuzzy George is wet . . . .
- Not fine — initially grey then wet
- Coarse ground initially wet
- Gritty? It is not clear
- After golf, wet snap may be so hard to define
- Coarse Yankee supporting Republican in win
- Gritty leaders of Germany, Romania and Italy never yield
- Hazy, beginning to get wet
Buddy explains!

The straight part
We know that "Not fine" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not fine = grainy.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 GRAINY mean?
GRAINY adjective- Resembling grains; granular.
- Coarsely ground or gritty.