Drove crazy, I had. Went too far (7)
I believe the answer is:
overdid
'went too far' is the definition.
(I've seen this before)
'drove crazy i had' is the wordplay.
'crazy' is an anagram indicator.
'i had' becomes 'id' (I'd).
'drove' anagrammed gives 'overd'.
'overd'+'id'='OVERDID'
(Other definitions for overdid that I've seen before include "Exaggerated" , "went too far" , "operated excessively" , "Made too much of" .)