Redrafted one post about a source of stir (8)
I believe the answer is:
teaspoon
'a source of stir' is the definition.
(a teaspoon can be used to stir)
'redrafted one post about' is the wordplay.
'redrafted' is an anagram indicator (to redraft something is to improve or rewrite it).
'about' becomes 'a' (abbreviation in Chambers).
'one'+'post'+'a'='oneposta'
'oneposta' anagrammed gives 'TEASPOON'.
(Other definitions for teaspoon that I've seen before include "Coffee stirrer?" , "Cooking unit" , "Small medicine dispensing unit" , "It creates a stir" , "Cutlery accompanying a cuppa" .)