Issue forth abundantly (4)
I believe the answer is:
well
I believe this is a double definition.
'issue forth' is the first definition.
(I've seen this before)
'abundantly' is the second definition.
(I've seen this before)
(Other definitions for well that I've seen before include "Sound" , "Water - thoroughly" , "The - at the World's End (William Morris)" , "satisfactory manner?" , "31 [SPRING]" .)