Menial worker (8)
I believe the answer is:
dogsbody
'menial worker' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for dogsbody that I've seen before include "Fetching and carrying worker" , "Person doing menial jobs" , "Put-upon person" , "Slave" , "One who has to do all the boring jobs" .)