Advanced nursing staff may be found here (6)

I believe the answer is:

onward

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'advanced' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

(Other definitions for onward that I've seen before include "Advancing (like Christian soldiers?)" , "With advancing motion" , "Forward, like Christian soldiers" , "In front" , "Advanced" .)

I've seen this clue in The Times.

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