Transposition of initial word sounds, such as "guzzles pud” for "puzzle's good” (10)
I believe the answer is:
spoonerism
(Other definitions for spoonerism that I've seen before include "Burly chassis for Shirley Bassey, say?" , "Regular announcement by old clergyman" , "A slip of the tongue? -- no promises (anag)" , "occasional cluing technique" , ""A lopping of sweaters", for example" .)