Crossword Genius

Call large bird, not difficult in East London (4)

Ross

I believe the answer is:

buzz

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'call' is the definition.
(thesaurus)

I don't understand the rest of the clue.

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(Other definitions for buzz that I've seen before include "Stimulation - sound of bee" , "phone call" , "Sense of excitement" , "Bee's noise" , "do like insects when flying" .)

I've seen this clue in The Telegraph.
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