The most common and most likely answer to this crossword clue is the 7 letter word REJOICE
I've seen this crossword clue in Financial Times
R
E
J
O
I
C
E
More clues leading to the result REJOICE
- Regarding outspoken Irish writer’s triumph
- Exult at commanding officer being overwhelmed by crude jeer
- Make merry, as lyricist bags English girl
- Extremely reclusive Irish writer expresses delight
- Take pleasure in note going to Irish writer, say
- Soldier, and little woman with reserve, celebrate
- Be very pleased about Irish writer’s broadcast
- On Irish author said to be merry
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.
What does REJOICE mean?
REJOICE verb- To be very happy, be delighted, exult; to feel joy.
- To have (someone) as a lover or spouse; to enjoy sexually.
- To make happy, exhilarate.
- To enjoy.