Switch positions? (3)
'switch positions?' is the definition.
(on and off are positions on a switch)
This is the entire clue.
(Other definitions for on-off that I've seen before include "Discontinuous" , "in bursts" .)
'switch positions?' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Another definition for ons that I've seen is " Stages".)