Spot bulk of voracious eater (5)

I believe the answer is:

locus

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'spot' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

(Other definitions for locus that I've seen before include "A defined position" , "Exact place of something" , "Particular position (of something)" , "Area of" , "Venue" .)

I've seen this clue in The Times.

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