Granite’s broken, extremely cross (8)
I believe the answer is:
angriest
'granite's broken extremely cross' is the definition.
I can't judge whether this defines the answer.
'granite's broken' is the wordplay.
'broken' indicates anagramming the letters.
'granites' anagrammed gives 'ANGRIEST'.
Can you help me to learn more?
(Other definitions for angriest that I've seen before include "Most irate and furious" , "Most wrathful" , "Extremely mad" , "Most incensed kind of ingrates" , "Most annoyed or hostile" .)