Call back (6)

I think it could be either:

Which length description are you looking for?:

echo

'call back' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for echo that I've seen before include "Say again or imitate" , "Sound heard before" , "Reflection of sound waves" , "Return of sound waves" , "Repeat or reverberate" .)

I've seen this clue in The Globe and Mail.

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