Shrove Tuesday follower (4)
I believe the answer is:
lent
'shrove tuesday follower' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for lent that I've seen before include "Forty days of penance" , "Pre-Easter period" , "Period of penance" , "Time of fasting" , "Christian penitential period" .)