Major water source (4)
I believe the answer is:
main
(Other definitions for main that I've seen before include "Might on the high seas" , "Chief, primary" , "Cardinal" , "associated with the Spanish?" , "river in Germany" .)
I believe the answer is:
main
(Other definitions for main that I've seen before include "Might on the high seas" , "Chief, primary" , "Cardinal" , "associated with the Spanish?" , "river in Germany" .)