Smartphone I fixed for one who distrusts mankind (11)
I believe the answer is:
Here is my best explanation:
'one who distrusts mankind' is the definition.
'smartphone i fixed' is the wordplay.
'fixed' indicates anagramming the letters.
'smartphonei' anagrammed gives 'MISANTHROPE'.
'for' acts as a link.
(Other definitions for misanthrope that I've seen before include "One who hates other people", "Hater of humankind", "Moliere character", "Definitely not a "people" person! - shipmate Ron (anag)", "Mankind hater", "I hate folk", "He hates everyone", "One with no love for fellow humans", "Unfortunately devoid of love" and "A hateful guy".)