According to Spooner, “Stay to dip and expose” (6)
I believe the answer is:
debunk
'expose' is the definition.
(synonyms)
I don't understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for debunk that I've seen before include "Reveal as false, show up" , "Expose pretensions of" , "Show to be exaggerated or false, claim or theory" , "Expose false claim" , "Ridicule" .)