Crossword Genius

Faint possibility hid the glade (5-6)

Ross

I believe the answer is:

light-headed

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'faint' is the definition.
(synonyms)

I cannot understand how the remainder of the clue works.

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(Other definitions for light-headed that I've seen before include "Dizzy, slightly faint" , "without serious thought" .)

I've seen this clue in The Mirror.
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