Stranger anxiety, confusing iPhone with a box (10)
I believe the answer is:
xenophobia
'stranger anxiety' is the definition.
(anxiety or fear of foreigners or strangers)
'confusing iphone with a box' is the wordplay.
'confusing' indicates anagramming the letters.
'with' says to put letters next to each other.
'a'+'box'='abox'
'iphone' put after 'abox' is 'aboxiphone'.
'aboxiphone' is an anagram of 'XENOPHOBIA'.
(Other definitions for xenophobia that I've seen before include "fear, stranger related" , "Excessive fear of foreigners" , "intolerance" , "Fear or dislike of foreigners" , "Hatred of foreigners" .)