Dogma from European in canvas shelter (5)
I believe the answer is:
tenet
'dogma' is the definition.
(I know that dogma can be written as tenet)
'european in canvas shelter' is the wordplay.
'european' becomes 'E' (abbreviation e.g. EU).
'in' is an insertion indicator.
'canvas shelter' becomes 'tent' (I've seen this in another clue).
'e' put within 'tent' is 'TENET'.
'from' acts as a link.
(Other definitions for tenet that I've seen before include "you may believe in it" , "Belief held as true" , "Opinion held to be true" , "Doctrine, dogma, belief" , "Belief - maxim" .)