Standard set by a large predatory animal (6)
I believe the answer is:
jackal
'predatory animal' is the definition.
(I've seen this before)
'standard set by a large' is the wordplay.
'standard' becomes 'jack' (both can refer to a flag).
'set by' says to put letters next to each other.
'large' becomes 'L' (eg in clothes sizes).
'jack'+'a'+'l'='JACKAL'
(Other definitions for jackal that I've seen before include "A wild flesh-eating dog-like animal" , "Flunkey; dog-like omnivore" , "Nocturnal mammal closely related to the dog" , "Wild canine of Africa and southern Asia" , "Frederick Forsythe novel: ''Day of the ......''" .)