Walk that's measured, say (4)
I believe the answer is:
Here is my best explanation:
'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' is a homophone of 'WADE'.
'that's' acts as a link.