Are evidently loose, which does worry you (6)

I believe the answer is:

rattle

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'worry you' is the definition.
'rattle' can be an answer for 'worry' (I've seen this before). I am not sure about the 'you' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for rattle that I've seen before include "Unnerve - baby's plaything" , "Venomous creature's warning" , "worry" , "Make someone nervous or anxious" , "Baby's toy - racket - disconcert" .)

I've seen this clue in the Evening Standard.

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