For easy success, exercise more than you really need (8)
I believe the answer is:
walkover
'really need' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'for easy success exercise more than you' is the wordplay.
I cannot quite understand how this works, but
'more' could be 'over' (I've seen this before) and 'over' is found in the answer.
The remaining letters 'walk' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for walkover that I've seen before include "An easy victory - stroll across" , "victory's easy" , "Unopposed victory" , "Piece of cake - child's play" , "Easy victory of ambulant sort?" .)