The most common and most likely answer to this crossword clue is the 6 letter word RUSSET
I've seen this crossword clue in The Times
R
U
S
S
E
T
More clues leading to the result RUSSET
- Coarse stuff from contrary girl booked after game?
- In Cyprus, settlers find apple
- In thesaurus setter finding name of apple
- Apple with fungal disease mostly covering batch
- Contrary heroine booked after game
- Apple runs America, agreed?
- Classical country group – hempen homespun?
- Back half of the Bull established as kind of brown
- Returning from the States – surely?
- Gates surely holds back Apple
Buddy explains!

The straight part
We know that "Coarse stuff" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case coarse stuff = russet.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 RUSSET mean?
RUSSET noun- A reddish-brown color.
- A coarse, reddish-brown, homespun fabric; clothes made with such fabric.
- A variety of apple with rough, russet-colored skin.
- A variety of potato with rough, dark gray-brown skin.
- (of apples, pears, etc.) To develop reddish-brown spots; to cause russeting.
- Having a reddish-brown color.
- Gray or ash-colored.
- Rustic, homespun, coarse, plain.
- The condition of leather when its treatment is complete, but it is not yet colored (stained) and polished.
- Having a rough skin that is reddish-brown or greyish; russeted.