I'm with Prudie, I also had patella down but it must be KNEECAP. That fits SKIRT in 50d, and the R in skirt fits QUAKER in 58 across. It also fits SERB in 51d. How about BISON for 59a? It fits the B in SERB.
It's a bit iffy but could 54 be kneecap - accepting where patella comes from you then need something for low down (cap meaning low down - the facts).
not quite there but nearly.
I'm with Prudie, I also had patella down but it must be KNEECAP. That fits SKIRT in 50d, and the R in skirt fits QUAKER in 58 across. It also fits SERB in 51d. How about BISON for 59a? It fits the B in SERB.
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