Overweight possibly, but able to get by (5)
I believe the answer is:
tubby
'overweight' is the definition.
(thesaurus)
'but able to get by' is the wordplay.
I cannot quite see how this works, but
an anagram of 'but' is 'tub' which is present in the answer.
'by' is within the answer.
No letters remain.
This explanation may well be incorrect...
'possibly' acts as a link.
Can you help me to learn more?
(Other definitions for tubby that I've seen before include "Looking round" , "Roly-poly" , "Generously proportioned" , "Plump" , "Short and rather fat" .)