Walk that's measured, say (4)
I believe the answer is:
wade
'walk' is the definition.
(wading is a kind of walking)
'measured say' is the wordplay.
'measured' becomes 'weighed' (weighing is a kind of measuring).
'say' indicates a 'sounds like' (homophone) clue.
'weighed' sounds like 'WADE'.
'that's' is the link.
(Other definitions for wade that I've seen before include "Proceed with difficulty" , "Virginia who won Wimbledon" , "Stride through water" , "Walk with effort through water" , "Walk with legs partly immersed" .)