The most common and most likely answer to this crossword clue is the 8 letter word FEELINGS
I've seen this crossword clue in The Daily Telegraph
F
E
E
L
I
N
G
S
Buddy explains!

The straight part
We know that "Passions" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case passions = feelings.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 FEELINGS mean?
FEELINGS noun- Sensation, particularly through the skin.
- Emotion; impression.
- (always in the plural) Emotional state or well-being.
- (always in the plural) Emotional attraction or desire.
- Intuition.
- An opinion, an attitude.