Suspect's story (5)
I believe the answer is:
alibi
'suspect's story' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for alibi that I've seen before include "Proof of not being at the scene of the crime" , "Legal term from the Latin 'elsewhere'" , "Proof of absence" , "Plea of absence" , "Defence that one was somewhere else at the time of a crime" .)