Close to Meteora, crowd entering in ecstasy for religious ceremony (9)
I believe the answer is:
sacrament
'for religious ceremony' is the definition.
(sacrament is a kind of religious ceremony)
'close to meteora crowd entering in ecstasy' is the wordplay.
'close to' suggests the final letters (the close/ending of).
'crowd' becomes 'cram' (I've seen this in another clue).
'entering' means one lot of letters goes inside another.
'in ecstasy' becomes 'sent' (I've seen this in another clue).
The last letter of 'meteora' is 'a'.
'a'+'cram'='acram'
'acram' placed within 'sent' is 'SACRAMENT'.
(Other definitions for sacrament that I've seen before include "Holy ritual" , "Orders" , "Sign of grace" , "Religious ceremony" , "Form of religious observance" .)