Story about king, one in early film (6)
I believe the answer is:
talkie
'early film' is the definition.
(I've seen this before)
'story about king one' is the wordplay.
'story' becomes 'tale' (synonyms).
'about' indicates putting letters inside.
'king' becomes 'K' (chess abbreviation).
'one' becomes 'i' (Roman numeral).
'k'+'i'='ki'
'tale' going around 'ki' is 'TALKIE'.
'in' is the link.
(Other definitions for talkie that I've seen before include "one shot with rabbit" , "Film that was a cinema revolution in its day" , "Early film with sound track" , "Sound film (as opposed to a silent one)" , "See 1 Across" .)