Smell right inside that's sharp (5)
I believe the answer is:
prong
'sharp' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'smell right inside' is the wordplay.
'smell' becomes 'pong' (pong can informally mean a bad smell).
'right' becomes 'r' (common abbreviation).
'inside' means one lot of letters goes inside another.
'pong' placed around 'r' is 'PRONG'.
'that's' acts as a link.
Can you help me to learn more?
(Other definitions for prong that I've seen before include "Tooth" , "Tine of a fork" , "Spike of fork etc" , "one gets stuck into dinner" , "Pointed end of fork" .)