Overweight porter (5)
I believe the answer is:
stout
This clue is a double definition.
'overweight' is the first definition.
(thesaurus)
'porter?' is the second definition.
('stout' can be a synonym of 'porter')
(Other definitions for stout that I've seen before include "Dark ale" , "of above-average weight" , "Portly or stalwart" , "Corpulent" , "Portly - porter" .)