Crash site potentially located in plains of Armenia (4)
I believe the answer is:
sofa
'crash site potentially' is the definition.
(you might crash on someone's sofa)
'located in plains of armenia' is the wordplay.
'located in' indicates the answer is hidden within the clue.
'SOFA' is hidden in the letters of 'plains of armenia'.
(Other definitions for sofa that I've seen before include "Item of furniture" , "Somewhere to sit" , "Upholstered seat for two or more" , "Wide padded seat" , "Chesterfield, maybe" .)