The most common and most likely answer to this crossword clue is the 4 letter word AIDA
I've seen this crossword clue in The Guardian
A
I
D
A
More clues leading to the result AIDA
- What opera fans want to see first hand?
- Slave girl’s excellent hairstyle
- A parent of Maisie who knew a princess
- An Indian, oddly, appearing in opera
- Funding a musical that may be fascinating?
- Help a female doomed to die
- help a heroine
- Funding a grand opera? Doesn’t sound like it!
- Help a character in opera
- Help put on ace opera
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.