Crossword Genius

She'll back us to the echo! (3)

Ross

I believe the answer is:

sue

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'she'll' is the definition.
I can't tell whether this definition defines the answer.

'back us to the echo' is the wordplay.
'back' says the letters should be written backwards.
'to the echo' becomes 'e' (phonetic alphabet: alpha, bravo, charlie etc.).
'us' backwards is 'su'.
'su'+'e'='SUE'

Can you help me to learn more?

(Other definitions for sue that I've seen before include "Bring a legal action" , "Appeal" , "Take legal action against (someone), girl's name" , "Susan (dim.)" , "Take court action" .)

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