On a bike, maybe, which is a big step (7)
I believe the answer is:
astride
'on a bike maybe which' is the definition.
I can't judge whether this defines the answer.
'a big step' is the wordplay.
'big step' becomes 'stride' (I've seen this in another clue).
'a'+'stride'='ASTRIDE'
'is' acts as a link.
Can you help me to learn more?
(Other definitions for astride that I've seen before include "With legs stretched apart - tirades (anag)" , "Straddling (horse)" , "Not side saddle" , "It dares to be with legs wider apart" , "On the back of" .)