Rocking robin, huge one seen next door (9)

I believe the answer is:

neighbour

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'one seen next door' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

'rocking robin huge' is the wordplay.
'rocking' indicates an anagram.
'robin'+'huge'='robinhuge'
'robinhuge' with letters rearranged gives 'NEIGHBOUR'.

Can you help me to learn more?

(Other definitions for neighbour that I've seen before include "One who must live alongside" , "someone close" , "One lives nearby" , "possibly providing part of watch?" , "whom you may force into beggary" .)

I've seen this clue in The Independent.

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