Recording to draw upon energy (4)
I believe the answer is:
tape
'recording' is the definition.
(tape is a kind of recording)
'draw upon energy' is the wordplay.
'draw' becomes 'tap' (tapping is a kind of drawing).
'upon' means one lot of letters go next to another.
'energy' becomes 'e' (physics symbol as in E=mc2).
'tap'+'e'='TAPE'
'to' is the link.
(Other definitions for tape that I've seen before include "that race winner may break" , "Video recording" , "Race finishing line strip" , "Record; finishing line" , "Breast this first to win foot-race" .)