Backflipping in dare, dirt bike user (5)
I believe the answer is:
rider
'bike user' is the definition.
(someone who rides a bike)
'backflipping in dare dirt' is the wordplay.
'backflipping' is a reversal indicator.
'in' indicates a hidden word.
'redir' can be found hidden inside 'dare dirt'.
'redir' backwards is 'RIDER'.
(Other definitions for rider that I've seen before include "qualification" , "Supplementary clause" , "Condition added to a legal document" , "Condition added to something already agreed" , "Equestrian addition by a jury" .)