Make confused commercial -- not working, missing an intro (5)
I believe the answer is:
addle
'make confused' is the definition.
(to addle is to confuse or baffle)
'commercial not working missing an intro' is the wordplay.
'commercial' becomes 'ad' (abbreviation for advertisement).
'not working' becomes 'idle' (I've seen this before).
'missing an intro' means to remove the first letter (the letter which introduces the word is removed).
'idle' with its initial letter taken off is 'dle'.
'ad'+'dle'='ADDLE'
(Other definitions for addle that I've seen before include "(Of egg) become rotten" , "Confuse; go off" , "Confuse - decay" , "(Of eggs) become rotten" , "Go rotten" .)