Make teenager mad (8)
I believe the answer is:
generate
'make' is the definition.
(generating is a kind of making)
'teenager mad' is the wordplay.
'mad' is an anagram indicator.
'teenager' anagrammed gives 'GENERATE'.
(Other definitions for generate that I've seen before include "Cause to arise; produce" , "Produce, create" , "Engender" , "Produce, electricity say" , "24 across (anag)" .)