A way ham is carved leading to complaint (6)
I believe the answer is:
asthma
'complaint' is the definition.
(asthma is a kind of disease)
'a way ham is carved leading' is the wordplay.
'way' becomes 'st' (**).
'is carved' indicates an anagram.
'leading' is a charade indicator (letters next to each other).
'ham' with letters rearranged gives 'hma'.
'a'+'st'+'hma'='ASTHMA'
'to' is the link.
(Other definitions for asthma that I've seen before include "Physical disorder" , "Breathing illness" , "Respiratory disorder with wheezing" , "Breathing complaint" , "Respiratory problem" .)