Calls back for the second time? (2-6)

I believe the answer is:

re-echoes

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'calls' is the definition.
The answer and definition can be both to do with communicating as well as being verbs in their -s form.
Perhaps they are linked in a way I don't understand?

'back for the second time?' is the wordplay.
'back' suggests the final letters (I've seen 'back of' mean this).
'second time?' becomes 'echoes' (I am not sure about this - if you are sure you should believe this answer much more).
The final letters of 'for the' are 're'.
're'+'echoes'='RE-ECHOES'

Can you help me to learn more?

I've seen this clue in The Telegraph.

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