Come to religious education supported by a church (5)
I believe the answer is:
reach
'come to' is the definition.
(I've seen this before)
'religious education supported by a church' is the wordplay.
'religious education' becomes 're'.
'supported by' means one lot of letters go next to another (letters go below - in down clue).
'church' becomes 'ch' (common abbreviation).
're'+'a'+'ch'='REACH'
(Other definitions for reach that I've seen before include "Limits within which something can be effective" , "Open stretch of water" , "Arrive at - stretch of river" , "Get in touch" , "Stretch of a river between two bends" .)