Portly porter (5)
I believe the answer is:
stout
This clue is a double definition.
'portly' is the first definition.
('stout' can be a synonym of 'portly')
'porter' is the second definition.
('stout' can be a synonym of 'porter')
(Other definitions for stout that I've seen before include "Inured to fatigue and hardship" , "Rather fat, stocky" , "Rather fat, drink" , "of above-average weight" , "Portly - porter" .)