Rattle made by vibrating teeth of ratchet (7)
I believe the answer is:
chatter
'rattle' is the definition.
(thesaurus)
'of ratchet' is the wordplay.
'of' indicates an anagram (the answer comes from or 'of' the letters).
'ratchet' is an anagram of 'CHATTER'.
'made by vibrating teeth' is the link.
I am not very happy about this link. Some or all of it may be part of another bit of the clue.
Can you help me to learn more?
(Other definitions for chatter that I've seen before include "Informal talk" , "Talk noisily" , "Prattle" , "Insignificant talk" , "Gas" .)