The most common and most likely answer to this crossword clue is the 7 letter word ODORISE
I've seen this crossword clue in The Guardian
O
D
O
R
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S
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More clues leading to the result ODORISE
Buddy explains!

The straight part
We know that "Scent" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case scent = odorise.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 ODORISE mean?
ODORISE verb- To add an odorant to (especially a gas, so that leaks can be more easily detected).