Regular servings of eclair for Biblical priest (3)

I believe the answer is:

eli

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for eli that I've seen before include "Biblical high priest" , "patriarch" , "Teacher of prophet Samuel" , "Shiloh priest (Bible)" , "Highest priest at Shiloh" .)

I've seen this clue in The Guardian.

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