Clue: Mouse fed with bit of ricotta, one making one's mark in carinas? (7)
Answer: SHRINER
Explanation: Definition: one making one's mark in carinas
We need a T here, but I can't see what should change. 
**SHINER **("mouse")* fed with* [*bit of*] **R**(icotta)
 
"Shiner" and "mouse" are both words for a black eye.