Duke with healthier — though incorrectly formed — liver (7)
I believe the answer is:
dweller
'incorrectly formed liver' is the definition.
'dweller' can be an answer for 'liver' (I've seen this before). I'm not certain of the 'incorrectly formed' bit.
'duke with healthier' is the wordplay.
'duke' becomes 'd'.
'with' means one lot of letters go next to another.
'healthier' becomes 'weller' ('well' is associated in meaning with 'healthy').
'd'+'weller'='DWELLER'
'though' is the link.
Can you help me to learn more?
(Other definitions for dweller that I've seen before include "Denizen" , "One living (at a place)" , "liver" , "Inhabitant" , "Resident" .)