The most common and most likely answer to this crossword clue is the 5 letter word VEILS
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More clues leading to the result VEILS
Buddy explains!

The straight part
We know that "Obscures" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case obscures = veils.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 VEILS mean?
VEILS noun- Something hung up or spread out to hide or protect the face, or hide an object from view; usually of gauze, crepe, or similar diaphanous material.
- A cover; disguise; a mask; a pretense.
- The calyptra of mosses.
- A membrane connecting the margin of the pileus of a mushroom with the stalk; a velum.
- A covering for a person or thing; as, a caul (especially over the head)
- Velum (A circular membrane round the cap of medusa)
- A thin layer of tissue which is attached to or covers a mushroom.
- An obscuration of the clearness of the tones in pronunciation.