Crossword Genius

Beat biblical epic, getting shot of the Tablets (5)

Ross

I believe the answer is:

throb

'beat' is the definition.
(throbbing is a kind of beating)

I don't understand how the rest of the clue works.

(Other definitions for throb that I've seen before include "Beat rhythmically" , "Beat like heart" , "Martin -; Kingsley -" , "Pound" , "Beat quickly from excitement etc" .)

I've seen this clue in The Guardian.
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