Crossword Genius

Added a couple of pages and finished (8)

Ross

I believe the answer is:

appended

'added' is the definition.
('append' can be a synonym of 'add')

'a couple of pages and finished' is the wordplay.
'couple of' says to double the letters.
'pages' becomes 'p'.
'and' is a charade indicator (letters next to each other).
'finished' becomes 'ended' (similar in meaning).
'p' doubled is 'pp'.
'a'+'pp'+'ended'='APPENDED'

(Another definition for appended that I've seen is " Added to the end".)

I've seen this clue in The Telegraph.
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