Ripped up shores with tool that's used to protect mounts (9)
I believe the answer is:
horseshoe
'used to protect mounts' is the definition.
I can't judge whether this definition defines the answer.
'ripped up shores with tool' is the wordplay.
'ripped up' indicates anagramming the letters.
'with' is a charade indicator (letters next to each other).
'tool' becomes 'hoe' (hoe is a kind of tool).
'shores' anagrammed gives 'horses'.
'horses'+'hoe'='HORSESHOE'
'that's' acts as a link.
Can you help me to learn more?
(Other definitions for horseshoe that I've seen before include "seen at extremities of bay" , "which may prove lucky" , "What a farrier provides" , "Supposedly lucky piece of metal" , "Lucky sign" .)