Solidly built due to drink? (5)
I believe the answer is:
stout
This clue is a double definition.
'solidly built' is the first definition.
(I've seen this in another clue)
'drink?' is the second definition.
(type of beer)
'due to' acts as a link.
(Other definitions for stout that I've seen before include "Heavily built; drink" , "Beer with malt" , "Portly - porter" , "Overweight; porter" , "Kind of beer" .)