Crossword Genius

They are useless twitches! (5)

Ross

I believe the answer is:

jerks

I'm a little stuck... Click here to teach me more about this clue!

'twitches' is the definition.
(I know this)

I don't understand 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)" , "stupid people" , "Yanks'" , "Jolts" .)

I've seen this clue in the Sydney Morning Herald.
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