Ophelia's brother (7)
I believe the answer is:
laertes
'ophelia's brother' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for laertes that I've seen before include "Man advised not to borrow" , "Ophelia's brother (Shak.)" , "Man at Danish court" , "Hamlet's killer" , "Someone opposed to Prince" .)