Baldwin's TV co-star (3)
I believe the answer is:
fey
'baldwin's tv co-star' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for fey that I've seen before include "slightly mad" , "Whimsical" , "Clairvoyant or doomed in Scotland" , "Clairvoyant, visionary" , "Strangely fanciful or clairvoyant" .)