Make a left or right (4)
'make a left or right' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for turn that I've seen before include "Shape (using a lathe)" , "roll" , "Start" , "Go off - act" , "fit" .)
(Other definitions for steer that I've seen before include "bovine creature" , "piece of advice" , "Guide the bull" , "Pilot a boat in desired direction" , "Direct; young ox" .)