One crook creates superstar (4)
I believe the answer is:
icon
'superstar' is the definition.
(I've seen this in another clue)
'one crook' is the wordplay.
'one' becomes 'I' (Roman numeral).
'crook' becomes 'con'.
'i'+'con'='ICON'
'creates' acts as a link.
(Other definitions for icon that I've seen before include "Image or representation" , "Image on computer screen representing facility" , "Representation on wooden panel of saint" , "Image - sex symbol" , "Representative symbol, may be on computer screen" .)