TV show first broadcast in 1975, once called the "Z-Cars of nursing” (6)

I believe the answer is:

angels

(Other definitions for angels that I've seen before include "Heavenely guardians" , "THIRD PART OF 12" , "See 9" , "Winged heavenly messengers" , "Gleans that they're heavenly" .)

I've seen this clue in The Times.

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