Singer Estefan (6)
I believe the answer is:
gloria
'singer estefan' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for gloria that I've seen before include "Woman's name - Christian hymn praising God" , "sung in church" , "service?" , "U2, Van Morrison and Vivaldi have all sung about her" , "song used by worshippers" .)