One of four making a disturbing noise (6)

I believe the answer is:

racket

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

'noise' is the definition.
(I know that noise can be written as racket)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for racket that I've seen before include "A lot of noise or stringed bat" , "Criminal enterprise" , "Din - strung bat" , "Loud noise and sports bat" , "Clamour; tennis bat" .)

I've seen this clue in The Irish Independent.

Want a hint initially instead of a full solution? Install my app