Turn aside right after avenue (5)
I believe the answer is:
avert
'turn aside' is the definition.
(thesaurus)
'right after avenue' is the wordplay.
'right' becomes 'rt'.
'after' says to put letters next to each other.
'avenue' becomes 'ave'.
'rt' put after 'ave' is 'AVERT'.
(Other definitions for avert that I've seen before include "Forestall" , "With prominent incisors" , "Turn away (ones eyes)" , "Turn aside or ward off" , "Prevent, ward off" .)