Short part of Easter sermon (5)
I believe the answer is:
terse
'short' is the definition.
(terse can mean short or brusque)
'part of easter sermon' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'TERSE' is hidden within 'easter sermon'.
(Other definitions for terse that I've seen before include "Brief and to the point" , "Abrupt, concise" , "Brief; abrupt" , "Curt, laconic of speech" , "Short and to the point" .)