One tendering change for part of a meal (10)
I believe the answer is:
ingredient
'part of a meal' is the definition.
('ingredient' is part of 'meal')
'one tendering change' is the wordplay.
'one' becomes 'i' (Roman numeral).
'change' is an anagram indicator.
'tendering' anagrammed gives 'ngredient'.
'i'+'ngredient'='INGREDIENT'
'for' is the link.
(Other definitions for ingredient that I've seen before include "Constituent" , "Something used in a recipe" , "Item in a recipe" , "Something required for a recipe" , "Component element" .)