Overalls (9)
I believe the answer is:
dungarees
'overalls' is the definition.
(I have seen 'Durable overalls ' mean 'dungarees' so perhaps 'overalls' could also mean 'dungarees')
This is all the clue.
(Other definitions for dungarees that I've seen before include "Overall" , "protection at work" , "Work overalls" , "Durable overalls" , "overalls required" .)