Arab follows street light at night
I believe the answer is:
star
'light at night' is the definition.
(I've seen this in another clue)
'arab follows street' is the wordplay.
'arab' becomes 'Ar.' (abbreviation in Chambers).
'follows' means one lot of letters go next to another.
'street' becomes 'st' (abbreviation).
'ar' after 'st' is 'STAR'.
(Other definitions for star that I've seen before include "top player" , "Outstanding entertainer" , "Celebrity - heavenly body" , "Chaste, pure" , "Bright" .)