Record finished before Edward realised (10)

I believe the answer is:

discovered

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'realised' is the definition.
Both the answer and definition are past participle verbs.
Maybe they are linked in a way I don't understand?

'record finished before edward' is the wordplay.
'record' becomes 'disc' (eg a CD, compact disc).
'finished' becomes 'over' (over can mean finished or ended).
'before' means one lot of letters go next to another.
'edward' becomes 'Ed' (short for Edward).
'disc'+'over'+'ed'='DISCOVERED'

Can you help me to learn more?

(Other definitions for discovered that I've seen before include "Found during search" , "Unexpectedly found" , "Was the first to observe" .)

I've seen this clue in The Telegraph.

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