Sell Ms James the script for 'Family Feud' (8)
I believe the answer is:
vendetta
'for family feud' is the definition.
(I've seen this before)
'sell ms james' is the wordplay.
'sell' becomes 'vend' (vending is a kind of selling).
'ms james' becomes 'etta' (I am not sure about this - if you are sure you should believe this answer much more).
'vend'+'etta'='VENDETTA'
'the script' acts as a link.
This may not be right. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for vendetta that I've seen before include "Bitter feud between families" , "Murderous feud" , "murderous campaign?" , "ongoing row" , "rivalry" .)