Food that may provide energy after excursion (5)
I believe the answer is:
tripe
'food that may' is the definition.
'tripe' can be an answer for 'food' (tripe is a kind of food). I am not certain of the rest of the definition.
'energy after excursion' is the wordplay.
'energy' becomes 'e' (physics symbol as in E=mc2).
'after' is a charade indicator (letters next to each other).
'excursion' becomes 'trip' (I've seen this before).
'e' put after 'trip' is 'TRIPE'.
'provide' is the link.
Can you help me to learn more?
(Other definitions for tripe that I've seen before include "Balderdash" , "Rot" , "which a freegan might eat?" , "Swallowed" , "Edible entrails" .)