Euro featured in price supply formula (6)
I believe the answer is:
recipe
'formula' is the definition.
(I know that formula can be written as recipe)
'euro featured in price supply' is the wordplay.
'euro' becomes 'E' (E resembles the Euro symbol).
'featured in' indicates putting letters inside.
'supply' indicates an anagram (in a supple way).
'price' is an anagram of 'rcipe'.
'e' inserted into 'rcipe' is 'RECIPE'.
(Other definitions for recipe that I've seen before include "List of ingredients" , "Directions for preparing food, etc" , "method for achieving success" , "Kitchen instructions" , "Formula for food dish" .)