Splendour of holy man blocking temptation (6)
I believe the answer is:
lustre
'splendour' is the definition.
('lustre' can be a synonym of 'splendour')
'holy man blocking temptation' is the wordplay.
'holy man' becomes 'st'.
'blocking' means one lot of letters goes inside another.
'temptation' becomes 'lure' (lure is a kind of temptation).
'st' placed into 'lure' is 'LUSTRE'.
'of' acts as a link.
(Other definitions for lustre that I've seen before include "Brightness from reflected light" , "Rustle with shine on surface" , "Radiance; reflective surface" , "Gloss, brightness" , "Gentle sheen, soft glow" .)