The most common and most likely answer to this crossword clue is the 5 plus 3 letter word SPLIT PEA
I've seen this crossword clue in The Guardian
S
P
L
I
T
P
E
A
More clues leading to the result SPLIT PEA
- Beetroot and apple is cooked with legume
- Capital letter pronounced, one’s in the soup
- ‘Tis 4 ingredients you need to mix for this sort of soup
- Food and fuel endlessly added onto rent
- Dried food? It’s apple crumble
- What could be seen as part of recipe, arid!
- Penny each for this vegetable?
- Processed veg – as regularly pre-war?
- Vegetable only half-cooked?
- Green food: the thing in cooked apples
Buddy explains!
The straight part
We know that "one’s in the soup" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one’s in the soup = split pea.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.