Religion is getting late start in the morning (5)
I believe the answer is:
islam
'religion' is the definition.
(Islam is a religion)
'is getting late start in the morning' is the wordplay.
'getting' is a charade indicator (letters next to each other).
'start' indicates taking the first letters.
'in the morning' becomes 'am' (short for ante meridiem - before noon).
The first letter of 'late' is 'l'.
'is'+'l'+'am'='ISLAM'
(Other definitions for islam that I've seen before include "Mails to Muslim religion" , "Religion based on teachings of Muhammad" , "Creed" , "Monotheistic religion" , "organised religion" .)