It calls you a rotten grape! (5)

I believe the answer is:

pager

I'm a little stuck... Click here to teach me more about this clue!

'it calls you a' is the definition.
I know nothing about this answer so I can't tell whether this works.

'rotten grape' is the wordplay.
'rotten' indicates an anagram.
'grape' is an anagram of 'PAGER'.

Can you help me to learn more?

(Other definitions for pager that I've seen before include "communicator?" , "message on this?" , "Bleeper device" , "Electronic messaging device" , "This may summon one" .)

I've seen this clue in the Sydney Morning Herald.

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