Open wound (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
gash
'open wound' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for gash that I've seen before include "Ghastly" , "Cut deeply" , "Long deep wound" , "score heavily" , "Spare - rubbish" .)