Actor Calhoun (4)
I believe the answer is:
rory
'actor calhoun' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for rory that I've seen before include "Form of Gaelic name Ruairidh, rhymes with Conservative" , "Fellow" , "Irishman" , "Male" , "Gaelic man?" .)