  The squeezed cross-bispectrum \bispeconed\ between the gravitational lensing
in the Cosmic Microwave Background and the 1D \lya\ forest power spectrum can
constrain bias parameters and break degeneracies between $\sigma_8$ and other
cosmological parameters. We detect \bispeconed\ with $4.8\sigma$ significance
at an effective redshift $z_\mathrm{eff}=2.4$ using Planck PR3 lensing map and
over 280,000 quasar spectra from the Dark Energy Spectroscopic Instrument's
first-year data. We test our measurement against metal contamination and
foregrounds such as Galactic extinction and clusters of galaxies by
deprojecting the thermal Sunyaev-Zeldovich effect. We compare our results to a
tree-level perturbation theory calculation and find reasonable agreement
between the model and measurement.
