The most common and most likely answer to this crossword clue is the 10 letter word POT-POURRI
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Buddy explains!

The straight part
We know that "source of fragrance" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case source of fragrance = pot-pourri.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 POT-POURRI mean?
POT-POURRI noun- A collection of various things; an assortment, mixed bag or motley.
- An anthology of miscellaneous prose.
- A medley of songs or music.
- A mixture of dried fragrant plant material, often in a decorative bowl, used to scent a room.
- A ragout or stew of meat and vegetables.