The most common and most likely answer to this crossword clue is the 5 letter word EQUUS
I've seen this crossword clue in Financial Times
E
Q
U
U
S
More clues leading to the result EQUUS
- Drama queen visiting much of Europe and America
- Petition raised about question in controversial 70s play
- Opponents accepting question for stage play
- Horseplay?
- Play face-card of superior rank twice, thwarting game opponents
- Eratosthenes’ First Question: American play
- Play Queen in Brussels and America
- Play + Film = Uranium – Aluminium
- Horse-play?
- 1973 drama starts to examine questions under unusual security
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.