Potential cause of tears involving religious view (7)
I believe the answer is:
opinion
'religious view' is the definition.
'opinion' can be an answer for 'view' ('opinion' can be a synonym of 'view'). I'm unsure of the 'religious' bit.
'potential cause of tears involving' is the wordplay.
'potential' becomes 'pi' (I can't justify this - if you can you should give a lot more credence to this answer).
'cause of tears' becomes 'onion' (I've seen this before).
'involving' means one lot of letters goes inside another.
'pi' put inside 'onion' is 'OPINION'.
Can you help me to learn more?
(Other definitions for opinion that I've seen before include "Belief not founded on proof or certainty" , "Belief or conviction" , "Personal belief or judgment" , "Estimation" , "Unproved belief or view" .)