Derelict (3)
I believe the answer is:
bum
'derelict' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for bum that I've seen before include "American tramp or English bottom" , "Begging" , "American hobo or vulgar backside" , "Behind" , "American hobo or vulgar bottom" .)