"Dead Poets Society" director (4)
I believe the answer is:
weir
'dead poets society director' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for weir that I've seen before include "River flow regulator" , "fish may be trapped in this enclosure" , "Something that may be seen across river" , "Small dam to regulate water flow" , "feature of some rivers" .)