Look into corpse covered in gore (6)
I believe the answer is:
bloody
'covered in gore' is the definition.
'look into corpse' is the wordplay.
'look' becomes 'lo'.
'into' means one lot of letters goes inside another.
'corpse' becomes 'body' (I've seen this before).
'lo' going into 'body' is 'BLOODY'.
(Other definitions for bloody that I've seen before include ""____ but unbowed"" , "Gory" , "Cruel, murderous" .)