Total clicks represents the sum of all clicks your banner ads have cumulatively recorded as part of your campaign. This can result as of listeners clicking on companion banners displayed during the audio ad exposure and / or banners displayed on third party websites they visit for campaigns making use of display retargeting.
How frequently does this metric update?
Interactions recorded as a result of companion banners being clicked are reported in a near real-time fashion, while clicks resulting from display retargeting can show with a delay up to several hours, due to required interaction with partner display networks. Normally all clicks being reported should fully settle within a day. For more granularity, there is also a daily trend available - which is also subject to an 8-hour aggregation interval.