Bag cardinal blessed (6)
I believe the answer is:
'blessed' is the definition.
'bag cardinal' is the wordplay.
'bag' becomes 'sac' (a small bag).
'cardinal' becomes 'red' (I've seen this in other clues).
(Other definitions for sacred that I've seen before include "not to be interfered with?" , "Sanctified" , "Like gravestones maybe" , "'Consecrated, holy (6)'" , "'Hallowed, holy (6)'" .)