With legs apart in a street journey (7)
I believe the answer is:
astride
'with legs apart' is the definition.
(as in sitting astride a horse)
'a street journey' is the wordplay.
'street' becomes 'st' (abbreviation).
'journey' becomes 'ride' (riding is a kind of journeying).
'a'+'st'+'ride'='ASTRIDE'
'in' is the link.
(Other definitions for astride that I've seen before include "It dares to be with legs wider apart" , "On the back of" , "Standing over amid tirades" , "Passing across" , "Not side saddle" .)