Losing time, walk to find way up? (4)
I believe the answer is:
ramp
'way up?' is the definition.
'losing time walk' is the wordplay.
'losing' indicates named letters should be taken away.
'time' becomes 't'.
'walk' becomes 'tramp' (tramp is a kind of walk).
'tramp' with 't' taken away is 'RAMP'.
'to find' is the link.
(Other definitions for ramp that I've seen before include "Slope - swindle" , "Inclination - swindle" , "motorway access road" , "Wheelchair access?" , "Slope - racket" .)