In this context, is a colloquial and direct slang term. The word "clock" is often used as a verb in the transgender community. To be "clocked" means that someone is detected as transgender. The term originates from the idea that someone "calls out" a trans person's gender identity.
While the "rainbow coalition" implies total unity, the relationship between transgender individuals and LGB communities has experienced historical friction and powerful reconciliation. The Fight for Inclusion tgp shemale big clock best