Office underling (4)
I believe the answer is:
peon
'office underling' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for peon that I've seen before include "lowly farm worker" , "Day-labourer" , "Spanish-American menial worker" , "A Mexican peasant or labourer" , "Spanish-American farm worker" .)