The most common and most likely answer to this crossword clue is the 11 letter word HORSERADISH
I've seen this crossword clue in The Daily Telegraph
H
O
R
S
E
R
A
D
I
S
H
More clues leading to the result HORSERADISH
- Almost set to tuck into chestnuts maybe with hot sauce?
- Sauce ingredient, bay perhaps, I'd switched during outbreak
- Savoury sauce artist fed to Andalusian beauty?
- Has his order changed for condiment?
- Hot spread so rare with serving of food that’s hot
- Sauce maybe Arab artist put on food
- His order has changed for condiment
- Root and branch ultimately is harder — so chopped up
Buddy explains!

The straight part
We know that "Root" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case root = horseradish.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 HORSERADISH mean?
HORSERADISH noun- A plant of the mustard family, Armoracia rusticana.
- A pungent condiment made from the root of the plant.