Bride's intention about religious education loomed large (7)
I believe the answer is:
towered
'loomed large' is the definition.
'towered' can be an answer for 'loomed' ('tower' can be a synonym of 'loom'). I am not certain of the 'large' bit.
'bride's intention about religious education' is the wordplay.
'bride's intention' becomes 'towed' (I can't justify this - if you can you should give a lot more credence to this answer).
'about' means one lot of letters goes inside another.
'religious education' becomes 're'.
'towed' going around 're' is 'TOWERED'.
Can you help me to learn more?
(Other definitions for towered that I've seen before include "Loomed (over)" , "Was taller and more eminent than others" , "rose" , "Was of great height, . . . . . . . over others" .)