Crossword Genius

*Call again, on a rotary phone (8)

Ross

I believe the answer is:

remedial

(Other definitions for remedial that I've seen before include "Intended to put right" , "Providing a cure for disease or deficiency" , "regain lost ground" , "intended to correct something" , "appropriate for poor learners" .)

I've seen this clue in The New York Times.
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