Crossword Genius

Stagger back to the rear as big bird comes over (4)

Ross

I believe the answer is:

rock

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'stagger' is the definition.
(I've seen this before)

'back to the rear as big bird comes over' is the wordplay.
'to the rear' indicates one should take the final letters (the back of the word).
'as big bird' becomes 'cor' (I can't explain this - if you can you should give a lot more credence to this answer).
'comes over' says the letters should be written backwards (I've seen 'coming over' mean this).
The final letter of 'back' is 'k'.
'k'+'cor'='kcor'
'kcor' in reverse letter order is 'ROCK'.

Can you help me to learn more?

(Other definitions for rock that I've seen before include "Reel from" , "Swing" , "Boulder - oscillate - sweetmeat" , "Boulder; music" , "See 17" .)

I've seen this clue in The Guardian.
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