Imitate character on the radio? (4)

I believe the answer is:

echo

I believe this clue is a double definition.

'imitate' is the first definition.
(I've seen this in another clue)

'character on the radio?' is the second definition.
(Echo is the radio codeword for E)

(Other definitions for echo that I've seen before include "The distant sound" , "Send back" , "repercussion" , "Parrot" , "Resound; (radar) return" .)

I've seen this clue in The Telegraph.

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