The most common and most likely answer to this crossword clue is the 5 letter word YUMMY
I've seen this crossword clue in Financial Times
Y
U
M
M
Y
Buddy explains!

The straight part
We know that "Delicious" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case delicious = yummy.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 YUMMY mean?
YUMMY adjective- (lighthearted) Delicious.
- A mother who is sexually attractive.