Dog with an atlas I misplaced (8)
I believe the answer is:
alsatian
'dog' is the definition.
(I know that Alsatian is a type of dog)
'an atlas i misplaced' is the wordplay.
'misplaced' indicates an anagram.
'an'+'atlas'+'i'='anatlasi'
'anatlasi' is an anagram of 'ALSATIAN'.
'with' is the link.
(Other definitions for alsatian that I've seen before include "Old Frenchman" , "Large dog and someone from northern France" , "Strong dog known as German Shepherd" , "Large canine, may be police dog" , "Breed of dog" .)