Device that's "fed" (5)
I believe the answer is:
meter
'device that's fed' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for meter that I've seen before include "Poe sometimes used this" , "Apparatus for measuring" , "Measuring device as for electricity consumption" , "Gauge" , "Measuring device as for electricity usage (5)" .)