This is based on the Add-A-Gram puzzles by wildBillMunson. You need to find a chain of words, such that each next word is an anagram of the previous word plus an additional letter.
For example, suitable inside a fool inside many covers might be solved with apt -> prat -> tarps
For this particular puzzle, your clues are:
A snake inside deadly poison inside Jamaican music inside fencing equipment inside assigns scores inside a belligerent name inside a seasonal demon
Hope you have fun with it!