Nutritive mineral (4)
I believe the answer is:
iron
'nutritive mineral' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for iron that I've seen before include "Box-shaped instrument of torture -- no meridian (anag)" , "1 down, symbol Fe" , "Former dividing line across Europe" , "Fe - golf club" , "Metal - press" .)