Walked at speed on the day (5)
I believe the answer is:
paced
'walked' is the definition.
(pacing is a kind of walking)
'speed on the day' is the wordplay.
'speed' becomes 'pace' (pace is a kind of speed).
'on' says to put letters next to each other.
'the day' becomes 'd' (abbreviation for day).
'pace'+'d'='PACED'
'at' acts as a link.
(Other definitions for paced that I've seen before include "Moved steadily" , "Measured (a distance) by walking" , "Steadily walked" , "Took steps" , "Made anxious moves" .)