Vivid chart recalled Channel Islands (7)
I believe the answer is:
graphic
'vivid' is the definition.
(I know that vivid can be written as graphic)
'chart recalled channel islands' is the wordplay.
'chart' becomes 'graph' (I've seen this in another clue).
'recalled' is a reversal indicator (to recall can mean to bring something back).
'channel islands' becomes 'CI'.
'ci' reversed gives 'ic'.
'graph'+'ic'='GRAPHIC'
(Other definitions for graphic that I've seen before include "Vividly descriptive" , "Giving vivid detail" , "Vivid - computer-generated image" , "(Of an account) vivid" , "Concerned with writing" .)