Flood out (4)
![Ross](/clue/static/ross-mug.min.png)
I believe the answer is:
gush
'flood out' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for gush that I've seen before include "Spout like oil-well" , "Speak/write effusively" , "Be over-effusive" , "Effuse" , "Sudden stream or jet" .)