The most common and most likely answer to this crossword clue is the 5 letter word CACAO
I've seen this crossword clue in The Times
C
A
C
A
O
More clues leading to the result CACAO
- Tree approximately twice the height of oak?
- About two times over what is needed to make chocolate
- Caught adult beginning to ask around 12: “Love some chocolate?”
- Substantial growth roughly doubled with ending of embargo
- Candies and chocolates and others: source of all of those?
- Seeds to eat when you are out of liqueur
- Daisy sounded out by stutterer in tree
- Tropical tree is about calcium, nothing 15
- Pair of Manx cats love tropical tree
- 4 disregarding news over tree
Buddy explains!

The straight part
We know that "Tree" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tree = cacao.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 CACAO mean?
CACAO noun- A tree, Theobroma cacao, whose seed is used to make chocolate.
- This tree's seed, the cocoa bean.