Meal prepared at home with new pigment (7)
I believe the answer is:
melanin
'pigment' is the definition.
(melanin is a kind of pigment)
'meal prepared at home with new' is the wordplay.
'prepared' indicates anagramming the letters.
'at home' becomes 'in' (similar in meaning).
'with' indicates putting letters inside.
'new' becomes 'n' (common abbreviation eg NT for New Testament).
'meal' is an anagram of 'mela'.
'mela'+'in'='melain'
'melain' enclosing 'n' is 'MELANIN'.
(Other definitions for melanin that I've seen before include "Pigment causing tanning" , "Tanning pigment in skin" , "Dark skin pigment" , "Brown skin pigment" , "tanning agent" .)