Crossword Genius

Everyone with long legs perhaps striking head (3)

Ross

I believe the answer is:

all

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'everyone' is the definition.
(all people)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for all that I've seen before include "Entire" , "Long avenue or garden path" , "Very nearly" , "nothing more" , "Passage in a formal garden" .)

I've seen this clue in The Times.
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