Burritos regularly providing energy (4)
I believe the answer is:
brio
'energy' is the definition.
(brio is a musical term meaning energy)
'burritos regularly' is the wordplay.
'regularly' means one should take alternating letters (regularly take one letter, leave next etc.).
The alternating letters of 'burritos' are 'BRIO'.
'providing' is the link.
(Other definitions for brio that I've seen before include "Vigour (in music)" , "Vivacity of style" , "Animation (Italian)" , "Enthusiasm" , "'Liveliness, vivacity (4)'" .)