The most common and most likely answer to this crossword clue is the 6 letter word SORREL
I've seen this crossword clue in Independent
S
O
R
R
E
L
More clues leading to the result SORREL
- Herb used in the making of sauces or relishes
- Penitent pruned the Spanish chestnut
- Plant found in the middle of resown barren fields
- Reddish-brown herb
- Steamroller dismantled, metal components thrown out
- Edible leaves of horse chestnut?
- Plant chestnut
- Perennial home for Windsor relatives
- Dock sides thus in advance
- Green vegetable salads often retain raw evergreen leaves for starters
Buddy explains!

The straight part
We know that "Edible leaves/horse/chestnut?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case edible leaves/horse/chestnut? = sorrel.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 SORREL mean?
SORREL noun- Any of various plants with acidic leaves, especially
- A drink, consumed especially in the Caribbean around Christmas, made from the flowers of Hibiscus sabdariffa: hibiscus tea.
- A brown colour, with a tint of red.
- Of a brown colour, with a tint of red. (especially: a sorrel horse)