Pitch Eliot back where some birds are going (2,4)

I believe the answer is:

to nest

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'some birds are going' is the definition.
I can't judge whether this definition defines the answer.

'pitch eliot back' is the wordplay.
'pitch' becomes 'tone' (tone is a kind of pitch).
'eliot' becomes 'ts' (TS Eliot).
'back' says the letters should be written backwards.
'ts' reversed gives 'st'.
'tone'+'st'='TO NEST'

'where' acts as a link.

Can you help me to learn more?

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

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