\begin{document}$ \left(X,T\right) $\end{document} doublet model including the exotic vectorlike X quark (VLQ-X) with an electric charge \begin{document}$ 5/3 $\end{document}, we study the production of the VLQ-X decaying into \begin{document}$ tW $\end{document} at the future Compact Linear Collider (CLIC) with \begin{document}$ \sqrt{s}=3 $\end{document} TeV including the initial state radiation and beamstrahlung effects. We focus on the final signals, including same-sign dileptons (electrons or muons), at least one b-tagged jet, and large missing transverse momentum. By performing detailed signal-to-background analyses and detector simulations, we obtain the \begin{document}$ 2\sigma $\end{document} exclusion capabilities and \begin{document}$ 5\sigma $\end{document} discovery reaches, respectively, on the mass of the VLQ-X \begin{document}$ m_{X} $\end{document} as well as the relevant parameters (\begin{document}${\rm Br}(X\to tW)$\end{document} for \begin{document}$ m_{X}<1500 $\end{document} GeV and the coupling strength \begin{document}$ g^{*} $\end{document} for \begin{document}$ m_{X}\geq1500 $\end{document} GeV) for some typical luminosities at the 3 TeV CLIC."> Search for an exotic vectorlike <i>X</i>-quark in same-sign dilepton final states at the future 3 TeV CLIC -
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