The most common and most likely answer to this crossword clue is the 7 letter word ENTHUSE
I've seen this crossword clue in The Daily Telegraph
E
N
T
H
U
S
E
More clues leading to the result ENTHUSE
- Tenth muse initially failing to inspire
- See hunt going out and sound keen!
- Umpteenth US evangelical stifles praise
- Feel passionate, then unusually good
- Prince and circle not present in penthouse rave
- See Hunt squirm and go into raptures
- See hunt sabotaged and wax lyrical
- Appear very interested, then change employment
- 13 Fire unspecified number entering river topless
- Be keen, loosen up then exercise
Buddy explains!

The straight part
We know that "rave" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case rave = enthuse.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 ENTHUSE mean?
ENTHUSE verb- To show enthusiasm
- To cause (someone) to feel enthusiasm or to be enthusiastic