Crossword Genius

Core position of hospital in NHS (6)

Ross

I believe the answer is:

middle

'core' is the definition.
(I know that core can be written as middle)

I can't explain the remainder of the clue.

(Other definitions for middle that I've seen before include "Group of clubs; distance" , "Centre or core" , "Heart" , "Intermediate" , "It's equidistant from the extremes" .)

I've seen this clue in The Guardian.
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