Male bikers, as it were, cycling — pardon? (8)
I believe the answer is:
clemency
'pardon?' is the definition.
(I know that pardon can be written as clemency)
I don't understand the rest of the clue.
(Other definitions for clemency that I've seen before include "The quality of mercy" , "Leniency and compassion towards offenders" , "Mercy, lenience" , "Mercy or charity" , "Readiness to forgive" .)