Cockney's safe place to turn east in road (6)
I believe the answer is:
avenue
'road' is the definition.
(avenue is a kind of road)
'cockney's safe place to turn east' is the wordplay.
'cockney's safe place' becomes ''aven' ('haven' - a haven is a safe place or sanctuary - said with the 'H' dropped - a cockney accent.).
'to turn' becomes 'U' (a 'U-turn' is a kind of turn).
'east' becomes 'e' (abbreviation).
'aven'+'u'+'e'='AVENUE'
'in' is the link.
(Other definitions for avenue that I've seen before include "Tee-lined road" , "Double row of trees" , "Way of approach" , "Broad tree-lined road" , "Entrance passage" .)