The most common and most likely answer to this crossword clue is the 8 letter word HAZELNUT
I've seen this crossword clue in Financial Times
H
A
Z
E
L
N
U
T
More clues leading to the result HAZELNUT
- Vegetarian food: obscure line taken by aficionado
- Obscure large cask turning up for fruit
- Fruit mushed with certain consonants in Spooner’s gob
- Cob in mist looks nervous under this initially
- Cob, one unknown to the Spanish teachers
- Left loaf after pea soup and fruit
- Girl’s teachers that can be found in bar
- Blears crazy for taste of Frangelico
- Hunt with zeal possibly an edible growth
- Head girl originally defines a filbert
Buddy explains!

The straight part
We know that "Cob" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cob = hazelnut.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 HAZELNUT mean?
HAZELNUT noun- The fruit of the hazel tree.