Crossword Genius

A theologian was first to get confused (6)

Ross

I believe the answer is:

addled

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'confused' is the definition.
(addling is a kind of confusing)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for addled that I've seen before include "Confused like infertile egg" , "Mentally confused, muddled" , "Confused like rotten egg" , "Perplexed -- rotten" , "Foolish or confused like bad egg" .)

I've seen this clue in The Telegraph.
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