I create works including very specialised stuff (9)
I believe the answer is:
esoterica
'i create works' is the definition.
I can't tell whether this definition defines the answer.
'very specialised stuff' is the wordplay.
'very' becomes 'esoteric' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'stuff' indicates the central letters (I've seen 'stuffing' mean this).
The middle letter of 'specialised' is 'a'.
'esoteric'+'a'='ESOTERICA'
'including' is the link.
Can you help me to learn more?
(Other definitions for esoterica that I've seen before include "Obscure things" , "secrets to a few" , "Mysterious or secret things" , "Material appearing mysterious" , "Specialized publications" .)