Bloodshed is turn-on? (4)
I believe the answer is:
gore
'bloodshed' is the definition.
(I know that bloodshed can be written as gore)
'turn-on?' is the wordplay.
'turn' becomes 'go' (a person's move in a board game).
'on?' becomes 're' (regarding).
'go'+'re'='GORE'
'is' is the link.
(Other definitions for gore that I've seen before include "piece of material" , "Result of bleeding" , "Bloodshed" , "Blood; stab with tusk" , "Blood on a piece let into a garment?" .)