Fight like a knight (4)
I believe the answer is:
tilt
'fight like a knight' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for tilt that I've seen before include "Lean, slope" , "Slope, slant" , "Joust; bias" , "Move into a sloping position, say a lance" , "Incline, slant" .)