Give the call sign (6)

I believe the answer is:

beckon

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'call sign' is the definition.
'beckon' can be an answer for 'call' (I've seen this in another clue). I am not sure about the 'sign' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for beckon that I've seen before include "Summon by gesturing" , "Summon with finger gesture" , "Summon with a wave" , "Gesture closer" , "Summon with raised finger" .)

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

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