Crossword Genius

Bad back prodded by our hospital nurse (7)

Ross

I believe the answer is:

nourish

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'nurse' is the definition.
(thesaurus)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for nourish that I've seen before include "encourage growth" , "Provide with materials for life and growth" , "Foster or cherish, often with food" , "Give sustenance to" , "Provide with sustenance for growth" .)

I've seen this clue in The Telegraph.
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