Vegetable substance in a wrapper (5)
I believe the answer is:
cigar
'a wrapper' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Maybe you can see an association between them that I can't see?
'vegetable substance' is the wordplay.
'vegetable' becomes 'cig' (I can't explain this - if you can you should give a lot more credence to this answer).
'substance' becomes 'Ar' (Ar is an example).
'cig'+'ar'='CIGAR'
'in' acts as a link.
Can you help me to learn more?
(Other definitions for cigar that I've seen before include "Roll of cured tobacco" , "Something to smoke" , "Havana, say" , "Havana, perhaps" , "Item kept in a humidor" .)