TV host Seacrest or actor Gosling (4)
I believe the answer is:
ryan
I believe this clue is a double definition.
'tv host seacrest' is the first definition.
(I've seen this in another clue)
'actor gosling' is the second definition.
(I've seen this in another clue)
(Other definitions for ryan that I've seen before include "one associated with private saving account" , "Gosling, perhaps" , "Irishman" , "Boy" , "US private" .)