Feeding ten, I turn to mince (8)
I believe the answer is:
nutrient
'feeding' is the definition.
(I've seen this before)
'ten i turn to mince' is the wordplay.
'to mince' indicates an anagram.
'ten'+'i'+'turn'='teniturn'
'teniturn' anagrammed gives 'NUTRIENT'.
(Other definitions for nutrient that I've seen before include "Good food" , "Substance that provides nourishment, may be included in 6 Down" , "It gives energy and builds tissue" , "Nourishing substance" , "Item of food" .)