Very much found among believers (orthodox) (4,2)
I believe the answer is:
ever so
'very much' is the definition.
(I've seen this in another clue)
'among believers orthodox' is the wordplay.
'among' says the answer is hidden in the clue.
'EVER SO' can be found hidden inside 'believers orthodox'.
'found' acts as a link.
(Other definitions for ever so that I've seen before include "To a very great extent" , "Jolly" , "really" , "Greatly" , "Extremely" .)