"Project Runway" host Klum (5)
I believe the answer is:
heidi
'project runway host klum' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for heidi that I've seen before include "book" , "Girl's name (from German)" , "lady - from Cologne?" , "German lady's name" , "Novel Swiss girl" .)