A Latina’s working guard dog, perhaps (8)
I believe the answer is:
alsatian
'guard dog perhaps' is the definition.
(Alsatians are often used as guard dogs)
'a latina's working' is the wordplay.
'working' is an anagram indicator.
'latinas' with letters rearranged gives 'lsatian'.
'a'+'lsatian'='ALSATIAN'
(Other definitions for alsatian that I've seen before include "Old Frenchman" , "Large dog and someone from Alsace" , "Strong dog known as German Shepherd" , "Large dog and person from northern France" , "Wolf-like dog" .)