Holy bag the colour of blood (6)
I believe the answer is:
sacred
'holy' is the definition.
('sacred' can be similar in meaning to 'holy')
'bag the colour of blood' is the wordplay.
'bag' becomes 'sac' (I've seen this before).
'the colour of blood' becomes 'red' (I've seen this before).
'sac'+'red'='SACRED'
(Other definitions for sacred that I've seen before include "Religious" , "Holy, blessed" , "'Consecrated, holy (6)'" , "Like gravestones maybe" , "not to be interfered with?" .)