10 across
E-copy
(4)
E-copy (4)
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The whole clue is the definition (& lit or double definition).
How the clue works
The whole clue E-copy works as a cryptic definition — think of it as a 'copy' of the letter E in the NATO phonetic alphabet, which gives you ECHO. Neatly, ECHO also means a copy or repetition in its own right, so the wordplay and definition are one and the same thing.