Prominent street art remains unfinished (4)
I believe the answer is:
star
'prominent' is the definition.
(thesaurus)
'street art remains unfinished' is the wordplay.
'street' becomes 'st'.
'remains unfinished' means to remove the last letter.
'art' with its final letter removed is 'ar'.
'st'+'ar'='STAR'
(Other definitions for star that I've seen before include "''Twinkle, twinkle, little ...'' (children's song)" , "Outstanding person" , "See 21" , "- - of Bethlehem" , "Take the lead role" .)