Fragrant stuff -- tip in or tip out (9)
I believe the answer is:
potpourri
'fragrant stuff' is the definition.
'potpourri' can be an answer for 'stuff' (I have seen 'miscellaneous stuff' mean 'potpourri' so perhaps 'stuff' could also mean 'potpourri'). I'm not sure about the 'fragrant' bit.
'tip in or tip out' is the wordplay.
'tip' becomes 'pour' (as in tipping or pouring from a vessel).
'in' indicates putting letters inside.
'out' indicates an anagram (out can mean wrong or inaccurate).
'or'+'tip'='ortip'
'ortip' anagrammed gives 'potri'.
'pour' placed into 'potri' is 'POTPOURRI'.
Can you help me to learn more?
(Other definitions for potpourri that I've seen before include "Air-freshener" , "Selection" , "Dried petal mix" , "leaves, petals etc." , "Petals and spices to perfume a room" .)