I'm about to trade whatever possible to get hold of cocaine variety (10)
I believe the answer is:
miscellany
'hold of cocaine variety' is the definition.
'miscellany' can be an answer for 'variety' (synonyms). I'm not sure about the 'hold of cocaine' bit.
'i'm about to trade whatever possible to get' is the wordplay.
'about' shows that the letters should be reversed in order.
'to trade' becomes 'sell' (to sell is to trade something for money).
'whatever' becomes 'any' (anything whatsoever).
'possible' becomes 'c' (I can't explain this - if you can you should give a lot more credence to this answer).
'to get' indicates putting letters inside.
'im' in reverse letter order is 'mi'.
'sell'+'any'='sellany'
'sellany' enclosing 'c' is 'scellany'.
'mi'+'scellany'='MISCELLANY'
Can you help me to learn more?
(Other definitions for miscellany that I've seen before include "Mixture" , "Hotch-potch" , "varied group" , "Varied collection" , "authors contribute" .)