Religious group (4)
'religious group' is the definition.
(eg a religious sect)
This is the entire clue.
(Other definitions for sect that I've seen before include "Group of people with unusual religious beliefs" , "Heretical group" , "Dissenting body" , "Cult group" , "Subdivision of a larger religious group" .)
'religious group' is the definition.
(as in a denomination within a church)
This is all the clue.
(Other definitions for denomination that I've seen before include "Type of currency, religion etc" , "Note's face value" , "Face value of a banknote, coin or postage stamp" , "Religious group - grade in series of designated values" , "Value of postage stamp; branch of religion" .)