Day of the ___ , 1971 Frederick Forsyth thriller (6)

I believe the answer is:

jackal

(Other definitions for jackal that I've seen before include "Canine mammal" , "The Day of the - (Forsyth)" , "A predatory carnivorous dog-like animal" , "Dog-like carnivore" , "A wild flesh-eating dog-like animal" .)

I've seen this clue in The Guardian.

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