Oil driller's setup (3)
I believe the answer is:
rig
'oil driller's setup' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for rig that I've seen before include "Oil derrick" , "Outfit; fix" , "Apparatus; (boat's) sails" , "Put sails on" , "Fix; costume" .)