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Oratory from HCE and ALP enigmatical (6)

Ross

I believe the answer is:

chapel

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

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

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(Other definitions for chapel that I've seen before include "Part of or alternative to church" , "NUJ members?" , "Nonconformist church" , "Perhaps part of cathedral" , "union group" .)

I've seen this clue in The Times.
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