Stable in just a tick (6)
I believe the answer is:
static
'stable' is the definition.
(I've seen this before)
'in just a tick' is the wordplay.
'in' says the answer is hidden in the clue.
'STATIC' is hidden within 'just a tick'.
(Other definitions for static that I've seen before include "Not moving or changing" , "Cast it (anag) - unmoving" , "Motionless like some kind of electricity" , "Still, unchanging" , "Unmoving like kind of electricity" .)