Spooner's glimpse behind Spooner's obscuration? (3-6)

I believe the answer is:

pea-souper

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'spooner's' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I don't see?

I cannot understand how the rest of the clue works.

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(Other definitions for pea-souper that I've seen before include "Thick smokey fog" , "Dense yellow fog" , "Dense, dirty fog" , "Thick, dirty, yellowish fog" .)

I've seen this clue in The Guardian.

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