(not disagreeing - commenting on the history of the term) Clanker has a history in Clone Wars.

https://starwars.fandom.com/wiki/Clanker

Every time they say "clanker" in the first season of The Clone Wars https://youtu.be/BNfSbzeGdoQ

EcksClips When Battle Droids became Clankers (May 2022) https://youtu.be/p06kv9QOP5s