The most common and most likely answer to this crossword clue is the 5 letter word PILAF
I've seen this crossword clue in The Daily Telegraph
P
I
L
A
F
Buddy explains!

The straight part
We know that "dish of rice" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dish of rice = pilaf.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 PILAF mean?
PILAF noun- A dish made by browning grain, typically rice, in oil and then cooking it with a seasoned broth, to which meat and/or vegetables may be added.