Actor MacLachlan (4)
I believe the answer is:
'actor maclachlan' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for kyle that I've seen before include "Transport system with floating trains" , "Narrow channel (Scots), rhymes with dossier" , "- - of Lochalsh" , "Narrow sea channel (in Scotland)" .)