Crossword Genius

Dirty EastEnder headbutts, in return getting floored (7)

Ross

I believe the answer is:

stunned

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'floored' is the definition.
('stun' can be a synonym of 'floor')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for stunned that I've seen before include "Knocked out; astonished" , "Stupefied" , "Dazed; astonished" , "Amazed" , "Taken aback" .)

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