Set in from the margin (6)
I believe the answer is:
indent
'set in from the margin' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for indent that I've seen before include "Start line further in from page margins than others" , "Set in from the margin" , "Move away from the left margin" , "Intend to be order for goods" , "Make a purchasing order - place away from the margin" .)