The most common and most likely answer to this crossword clue is the 7 letter word LADANUM
L
A
D
A
N
U
M
More clues leading to the result LADANUM
Buddy explains!

The straight part
We know that "resin" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case resin = ladanum.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.
Crossword Answer definitions
LADANUM noun- A sticky brown resin obtained from species of rockrose, used mainly in perfume.