Food component — gorge to get energy needed initially (6)
I believe the answer is:
gluten
'food component' is the definition.
(component in some foods)
'gorge to get energy needed initially' is the wordplay.
'gorge' becomes 'glut' (synonyms).
'to get' is a charade indicator (letters next to each other).
'initially' indicates taking the first letters.
The first letters of 'energy needed' is 'en'.
'glut'+'en'='GLUTEN'
(Other definitions for gluten that I've seen before include "Sticky substance" , "Protein in grain that gives cohesiveness to dough" , "Protein source" , "Protein left after starch is removed from cereal grains" , "Substance contained in many grains" .)