Crossword Genius

Becomes zombie? Knickers! (6)

Ross

I believe the answer is:

undies

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'knickers' is the definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Maybe there's an association between them I don't understand?

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for undies that I've seen before include "Personal attire" , "Knickers (abbrev.)" , "clothing not normally seen" , "linen" , "Undergarments (colloq.)" .)

I've seen this clue in The Sun.
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