Pooh-pooh bust said to interrupt boom, perhaps (7)
I believe the answer is:
disdain
'pooh-pooh' is the definition.
(synonyms)
'bust said to interrupt boom perhaps' is the wordplay.
'bust' is an anagram indicator.
'to interrupt' is an insertion indicator.
'boom perhaps' becomes 'din' (synonyms. I am not sure about the 'perhaps' bit.).
'said' with letters rearranged gives 'sdai'.
'sdai' inserted into 'din' is 'DISDAIN'.
Can you help me to learn more?
(Other definitions for disdain that I've seen before include "Contumely" , "Haughtiness" , "'Contempt, condescension (7)'" , "Arrogance" , "Hauteur" .)