Not be straight with (5)
'not be straight with' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for lie to that I've seen before include "Become stationary (naut.)" , "(Of a ship) come almost to a stop going into the wind" , "Remain motionless" , "ship's to show no sign of movement" , "See 10 Across" .)