@ewildn Hello. It appears that you will have to use an 'Element click' selector with the 'Click' targeting - a.tooltip
Example:
{"_id":"iproperty-com","startUrl":["https://www.iproperty.com.sg/realestate/findanagent.aspx"],"selectors":[{"clickElementSelector":"a.tooltip","clickElementUniquenessType":"uniqueCSSSelector","clickType":"clickOnce","delay":1000,"discardInitialElements":"do-not-discard","id":"phone-reveal-click","multiple":true,"parentSelectors":["_root"],"selector":"body","type":"SelectorElementClick"},{"delay":0,"id":"wrapper","multiple":true,"parentSelectors":["_root"],"selector":"td table","type":"SelectorElement"},{"delay":0,"id":"phone","multiple":false,"parentSelectors":["wrapper"],"regex":"","selector":"b","type":"SelectorText"}]}