Diversity among strangers (5)
I believe the answer is:
range
'diversity' is the definition.
(I've seen this in another clue)
'among strangers' is the wordplay.
'among' says the answer is hidden in the clue.
'RANGE' is hidden within 'strangers'.
(Other definitions for range that I've seen before include "Scope; ambit" , "Series of hills or mountains" , "Where to cook" , "1 across [CLASSIFY]" , "Number of items in a series" .)