Confusing speaker helping himself to sugar? (7)

I believe the answer is:

spooner

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'confusing speaker' is the definition.
(as in Spoonerisms)

I don't understand how the remainder of the clue works.

(Other definitions for spooner that I've seen before include "Original transposer of initial letters in speech" , "One who gave his name to a transposition of sounds in speech" , "Revd W.A.- was famed for his errors in speech" , "Initial-transposing clergyman" , "One known for speech transpositions" .)

I've seen this clue in The Times.

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