The most common and most likely answer to this crossword clue is the 5 letter word MEATY
I've seen this crossword clue in Financial Times
M
E
A
T
Y
More clues leading to the result MEATY
Buddy explains!

The straight part
We know that "nourishing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case nourishing = meaty.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 MEATY mean?
MEATY adjective- Of, relating to, or containing meat.
- Resembling meat in flavour, etc.
- Of a person or a body part, large and solid.
- Substantial.