Pedestrian exercise completed in easy victory (8)
I believe the answer is:
walkover
'easy victory' is the definition.
(I've seen this before)
'pedestrian exercise completed' is the wordplay.
'pedestrian exercise' becomes 'walk' (I can't justify this - if you can you should give a lot more credence to this answer).
'completed' becomes 'over' (synonyms).
'walk'+'over'='WALKOVER'
'in' is the link.
Can you help me to learn more?
(Other definitions for walkover that I've seen before include "victory's easy" , "Uncontested race" , "Easy victory of ambulant sort?" , "An easy victory - stroll across" , "Piece of cake - child's play" .)