The most common and most likely answer to this crossword clue is the 8 letter word EXPOSING
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Buddy explains!

The straight part
We know that "Unmasking" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case unmasking = exposing.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 EXPOSING mean?
EXPOSING verb- To reveal, uncover, make visible, bring to light, introduce to.
- To subject photographic film to light thereby recording an image.
- To abandon, especially an unwanted baby in the wilderness.
- To submit to an active (mostly dangerous) substance like an allergen, ozone, nicotine, solvent, or to any other stress, in order to test the reaction, resistance, etc.
- To make available to other parts of a program, or to other programs.