Actor Somerhalder (3)
I believe the answer is:
ian
'actor somerhalder' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ian that I've seen before include "The familar Dr Paisley" , "The familiar Mr Paisley" , "Botham or Chappell?" , "Scottish John" , "Boy's name (Scottish?)" .)