X, anonymous New Testament building occupier (6)

I believe the answer is:

tenant

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'occupier' is the definition.
(I know that tenant is a type of occupier)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tenant that I've seen before include "Leaseholder" , "One who pays rent" , "his flat?" , "Someone who pays rent" , "Renting occupant" .)

I've seen this clue in The Times and The Sunday Times.

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