No promises broken — did I hear it wrong? (10)
I believe the answer is:
spoonerism
'did i hear it wrong?' is the definition.
I can't tell whether this definition defines the answer.
'no promises broken' is the wordplay.
'broken' indicates anagramming the letters.
'no'+'promises'='nopromises'
'nopromises' anagrammed gives 'SPOONERISM'.
Can you help me to learn more?
(Other definitions for spoonerism that I've seen before include "Verbal exchange of leading characters" , "A slip of the tongue? -- no promises (anag)" , "occasional cluing technique" , "Burly chassis for Shirley Bassey, say?" , "Regular announcement by old clergyman" .)