Chatty story about king at four (9)
I believe the answer is:
talkative
'chatty' is the definition.
(I know that chatty can be written as talkative)
'story about king at four' is the wordplay.
'story' becomes 'tale' (synonyms).
'about' is an insertion indicator.
'king' becomes 'K' (abbreviation for king in chess).
'four' becomes 'IV' (Roman numerals).
'k'+'at'+'iv'='kativ'
'tale' going around 'kativ' is 'TALKATIVE'.
(Other definitions for talkative that I've seen before include "Garrulous, loquacious" , "Inclined to speak" , "Gabby" , "Wordy" , "Chatty" .)