The most common and most likely answer to this crossword clue is the 7 letter word FERVENT
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More clues leading to the result FERVENT
Buddy explains!

The straight part
We know that "passionate" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case passionate = fervent.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 FERVENT mean?
FERVENT adjective- Exhibiting particular enthusiasm, zeal, conviction, persistence, or belief.
- Having or showing emotional warmth, fervor, or passion.
- Glowing, burning, very hot.