Clear street crossing island (3)
I believe the answer is:
rid
'clear' is the definition.
('rid' can be a synonym of 'clear')
'street crossing island' is the wordplay.
'street' becomes 'rd' (**).
'crossing' indicates putting letters inside.
'island' becomes 'i'.
'rd' going around 'i' is 'RID'.
(Other definitions for rid that I've seen before include "Free, disencumber" , "Free (person of affliction)" , "Free (someone of something unwanted)" , "Throw off, unburden" , "Clear, remove" .)