Belief leader of expedition is perhaps camping? (5)

I believe the answer is:

tenet

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'belief' is the definition.
(synonyms)

I can't explain the rest of the clue.

(Other definitions for tenet that I've seen before include "Conviction" , "A belief or creed - a palindrome" , "Adiaphoron" , "A palindromic doctrine or creed" , "A belief or credo - it's a palindrome" .)

I've seen this clue in The Times.

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