Confuse dub feel arranged to involve introduction to Dumbo (8)
I believe the answer is:
befuddle
'confuse' is the definition.
(I know that confuse can be written as befuddle)
'dub feel arranged to involve introduction to dumbo' is the wordplay.
'arranged' is an anagram indicator (letters rearranged).
'to involve' indicates putting letters inside (inserted letters get involved).
'introduction to' indicates taking the first letters.
The first letter of 'dumbo' is 'd'.
'dub'+'feel'='dubfeel'
'dubfeel' is an anagram of 'befudle'.
'befudle' placed around 'd' is 'BEFUDDLE'.
(Other definitions for befuddle that I've seen before include "Discombobulate" , "Make stupid with drink" , "Muddle, confuse" , "Baffle" , "Bewilder" .)