Tracking, so to speak (4)
I believe the answer is:
onto
(Other definitions for onto that I've seen before include "Conscious of" , "To the whole of (maths.)" , "In dispute over" , "Small Scottish farm" , "In contact with - aware of" .)
I believe the answer is:
onto
(Other definitions for onto that I've seen before include "Conscious of" , "To the whole of (maths.)" , "In dispute over" , "Small Scottish farm" , "In contact with - aware of" .)