He's a dapper sort, although somewhat dumpy (4-6)
I believe the answer is:
pear-shaped
'somewhat dumpy' is the definition.
I can't tell whether this defines the answer.
'he's a dapper sort' is the wordplay.
'sort' indicates an anagram.
'hes'+'a'+'dapper'='hesadapper'
'hesadapper' with letters rearranged gives 'PEAR-SHAPED'.
'although' is the link.
Can you help me to learn more?
(Other definitions for pear-shaped that I've seen before include "Bottom-heavy: (gone) wrong" , "(Go) horribly wrong; like three Satie pieces" , "With hips very wide compared to the upper body" , "Fat at one end and thin at the other - all wrong!" .)