Evangelist's exhortation (6)
I believe the answer is:
repent
'evangelist's exhortation' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for repent that I've seen before include "Deplore" , "Turn away from sin" , "lying on the ground" , "Be contrite, ye sinners" , "Be ashamed" .)