The first measurement of ${C!P}$ asymmetries in the decay ${B_s^0to J/psi overline{K}^{*}(892)^{0}}$ and an updated measurement of its branching fraction and polarisation fractions are presented. The results are obtained using data corresponding to an integrated luminosity of $3.0,fb^{-1}$ of proton-proton collisions recorded with the LHCb detector at centre-of-mass energies of $7$ and $8,mathrm{TeV}$. Together with constraints from ${B^0to J/psi rho^0}$, the results are used to constrain additional contributions due to penguin diagrams in the ${C!P}$-violating phase ${{phi}_{s}}$, measured through ${B_s^0}$ decays to charmonium.
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