The most common and most likely answer to this crossword clue is the 8 letter word CINNAMON
I've seen this crossword clue in The Guardian
C
I
N
N
A
M
O
N
More clues leading to the result CINNAMON
- One engaged by TV network in the morning working in brown
- Stocked by fantastic inn, amontillado’s spicy stuff
- Picked up criminal with second name that’s Brown
- Victualling-house in river getting on with flavouring
- Spice for 15 Roman character early in the week
- Working dogs returning last of carrion amid frenzied bark
- Person at fault reportedly, one that’s entered order largely for spicy stuff
- Something spicy to read about pub in the morning
- Cracked up about new acceptable flavouring
- Crooked conman smuggling fashionable spice
Buddy explains!

The straight part
We know that "Brown/Brown" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case brown/brown = cinnamon.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 CINNAMON mean?
CINNAMON noun- A small evergreen tree native to Sri Lanka and southern India, Cinnamomum verum or Cinnamomum zeylanicum, belonging to the family Lauraceae.
- Several related trees, notably the Indonesian cinnamon (Cinnamomum burmanni) and Chinese cinnamon or cassia (Cinnamomum aromaticum or Cinnamomum cassia).
- A spice from the dried aromatic bark of the cinnamon tree, either rolled into strips or ground into a powder. The word is commonly used as trade name for spices made of any of the species above.
- A warm yellowish-brown color, the color of cinnamon.
- Containing cinnamon, or having a cinnamon taste.
- Of a yellowish-brown color.