The 'Clara' call was certainly used in Royal Australian Navy carrier ops (HMAS Melbourne, Grumman Trackers and Douglas Skyhawks in the 70's and 80's). The RAN used US Navy procedures with a 'meatball' system based on a mirror (no Fresnel lens but similar presentation).
Occasionally 'Clara' had to be called when sun glare in the mirror obscured the 'meatball'.