Chanced taking a wild ride round the borders of Southwark (6)
I believe the answer is:
risked
'chanced' is the definition.
('risk' can be a synonym of 'chance')
'a wild ride round the borders of southwark' is the wordplay.
'a wild' indicates anagramming the letters.
'round' means one lot of letters goes inside another.
'the borders of' says to hollow out the word (remove centre letters).
'southwark' with its centre removed is 'sk'.
'ride' anagrammed gives 'ried'.
'ried' placed around 'sk' is 'RISKED'.
'taking' is the link.
(Other definitions for risked that I've seen before include "Exposed to danger or loss" , "Took a chance, gambled" , "Incurred the chance of misfortune" .)