Smelly and sharp, right inside (5)
I believe the answer is:
acrid
'smelly' is the definition.
Both the definition and answer are adjectives. Maybe there's a link between them I don't understand?
'sharp right inside' is the wordplay.
'sharp' becomes 'acid' (as in sharp-tasting).
'right' becomes 'r' (common abbreviation).
'inside' indicates putting letters inside.
'acid' placed around 'r' is 'ACRID'.
'and' is the link.
Can you help me to learn more?
(Other definitions for acrid that I've seen before include "Having a bitter smell or taste" , "causing corrosion" , "Stinging" , "Unpleasantly strong-smelling" , "Pungent or sharp, like smoke" .)