Wetter prince? (7)
I believe the answer is:
rainier
I believe this is a double definition.
'wetter' is the first definition.
('rainy' can be similar in meaning to 'wet')
'prince?' is the second definition.
(Prince Rainier of Monaco)
(Other definitions for rainier that I've seen before include "more cats and dogs?" , "Former prince of Monaco" , "weather getting worse" , "Mountain" , "This is more likely to pour down" .)