Tearing out rock (7)
I believe the answer is:
granite
'rock' is the definition.
(type of rock)
'tearing out' is the wordplay.
'out' indicates anagramming the letters (out can mean wrong or inaccurate).
'tearing' is an anagram of 'GRANITE'.
(Other definitions for granite that I've seen before include "Very hard type of rock" , "A very hard rock from Tangier" , "Showing great resolution" , "Constituent in Dartmoor" , "Crystalline rock" .)