Craig turned into a smoker (5)
I believe the answer is:
cigar
'a smoker' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
I also know that 'smoker' relates to this answer.
'craig turned' is the wordplay.
'turned' is an anagram indicator.
'craig' is an anagram of 'CIGAR'.
'into' is the link.
Can you help me to learn more?
(Other definitions for cigar that I've seen before include "Cylinder of tobacco" , "Havana, perhaps" , "Close, but no ___ !" , "Big roll of tobacco" , "Corona, eg" .)