Cured from having had a fag? (6)
I believe the answer is:
smoked
'cured' is the definition.
(I've seen this before)
'having had a fag?' is the wordplay.
I cannot really understand how this works, but
'had' could be 'd' (I've seen this in other clues) and 'd' is present in the answer.
'fag?' could be 'smoke' (both can mean a cigarette) and 'smoke' is present in the answer.
No letters remain.
This explanation may well be incorrect...
'from' is the link.
Can you help me to learn more?
(Other definitions for smoked that I've seen before include "Cured over fire" , "Had a cigarette" , "Dried and cured by hanging in wood fumes" , "Dried and cured by hanging in wood vapour" , "Fumigated; cured" .)