Wally and Alfred going for a cycle (7)
I believe the answer is:
halfwit
'a cycle' is the definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
'wally and alfred going' is the wordplay.
I cannot really understand how this works, but
'alfred' could be 'al' and 'al' is present in the answer.
This may be the basis of the clue (or it may be nonsense).
'for' is the link.
Can you help me to learn more?
(Other definitions for halfwit that I've seen before include "Charlie?" , "dunce?" , "One only 50% all there?" , "Being stupid" , "Mug" .)