Crossword Genius

An egghead, seemingly encamped, is dogmatic (5)

Ross

I believe the answer is:

tenet

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'an egghead' is the definition.
Although both the answer and definition are singular nouns, I don't understand how they can define each other.

I don't understand the rest of the clue.

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(Other definitions for tenet that I've seen before include "Matter of belief" , "A palindromic doctrine or creed" , "Dogma or principle" , "Belief held as true" , "A religious doctrine proclaimed as true without proof" .)

I've seen this clue in the Evening Standard.
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