The most common and most likely answer to this crossword clue is the 3 plus 4 letter word SOY BEAN
I've seen this crossword clue in The Daily Telegraph
S
O
Y
B
E
A
N
More clues leading to the result SOY BEAN
Buddy explains!

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.