One who dislikes people misusing smartphone devices essentially (11)
I believe the answer is:
misanthrope
'one who dislikes people' is the definition.
The answer is a person as well as being a singular noun. This is suggested by the definition.
'misusing smartphone devices essentially' is the wordplay.
'misusing' indicates an anagram.
'essentially' means to look at the middle letters.
The central letter of 'devices' is 'i'.
'smartphone'+'i'='smartphonei'
'smartphonei' anagrammed gives 'MISANTHROPE'.
Can you help me to learn more?
(Other definitions for misanthrope that I've seen before include "One hating humankind" , "Unfortunately devoid of love" , "One who hates other people" , "I hate folk" , "Hater of humankind" .)