Volatile market brought about end of the neighbourhood watch member (7)
I believe the answer is:
meerkat
'neighbourhood watch member' is the definition.
'volatile market brought about end of the' is the wordplay.
'volatile' indicates an anagram.
'brought about' is an insertion indicator.
'end of' says to take the final letters.
The last letter of 'the' is 'e'.
'market' anagrammed gives 'merkat'.
'merkat' enclosing 'e' is 'MEERKAT'.
(Other definitions for meerkat that I've seen before include "Wild animal" , "Strange tee mark made by the four-toed animal" , "African mongoose often on two feet" , "South African mammal" , "Mongoose-like animal" .)