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a writing hand crippled permanently in the shape of a claw =script with no good handwriting?

Context:

By the end of the academic year I had several large three ring notebooks of briefs, and what seemed a writing hand crippled permanently in the shape of a claw. Oh well ....
Comments  
No, it means that the writer had written so much that, as a result, his/her hand became "crippled" - i.e. it took on the shape of holding the pen.
Thanks