Crossword Genius

Fatheads making sudden movements (5)

Ross

I believe the answer is:

jerks

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'sudden movements' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for jerks that I've seen before include "Exercises; fools (slang)" , "Jolts" , "Yanks'" , "stupid people" .)

I've seen this clue in the Evening Standard.
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