\begin{document}$ m_N \gtrsim 1 $\end{document} TeV) at a future 3 TeV Compact Linear Collider (CLIC). We focus on two distinct decay topologies: (i) \begin{document}$ N \to \ell^\pm W^\mp $\end{document} with hadronic W boson decay, leading to a final state with one charged lepton and a hadronic fat jet \begin{document}$ J_W $\end{document}; and (ii) \begin{document}$ N \to \nu h $\end{document} with subsequent Higgs decay \begin{document}$ h \to b\bar{b} $\end{document}, yielding a Higgs-tagged fat jet \begin{document}$ J_h $\end{document} and \begin{document}$\not{E}_T$\end{document}. Based on comprehensive detector-level simulations and background analysis, we present both \begin{document}$ 2\sigma $\end{document} exclusion limits and \begin{document}$ 5\sigma $\end{document} discovery reaches in the \begin{document}$ m_N $\end{document}–\begin{document}$ |V_{\ell N}|^2 $\end{document} plane. We further extract 95% confidence level upper limits on the mixing parameter \begin{document}$ |V_{\ell N}|^2 $\end{document} and perform a detailed comparison with existing constraints from direct searches at future colliders and indirect global fits. Our findings demonstrate that a 3 TeV CLIC can improve the sensitivity to \begin{document}$ |V_{\ell N}|^2 $\end{document} by about two orders of magnitude compared with the projected reaches of future hadron colliders while remaining competitive with other CLIC search channels."> Searches for heavy neutrinos at a 3 TeV CLIC in fat jet final states -
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