Theater walkway); ARCED (30D. Like parabolas); AVAIL (4D. Be of help to); AXELS (27D. Leaps in ice-skating); CAROB (9D. Chocolate substitute); CLANS (25D. Family groups); FERMI (5D. Physicist Enrico); FLARE (45A. Solar phenomenon); NOISE (37D. Static, e.g.); REDDY (55D. Helen who sang “I Am Woman”); RENEE (36A. Actress Zellweger); SKIER (35D.