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CP-violation in $\Delta A_{\textrm {CP}} = -0.154(29)$, in the $D^0 \to\pi^+\pi^-/K^+K^-$ system, is established and its central value is one order ofmagnitude above the naive Standard Model (SM) estimate. It remains unclearwhether this is due to currently incalculable strong interaction matrixelements or genuine new physics (NP) such as a shift in ${\cal O}_8$ with aweak phase. We show that the interference of the long-distance (LD) terms withthe ${\cal O}_8$ matrix element can give rise to $A_{\text{CP}}^{D \to V\gamma} = \textrm{few} \cdot 10^{-3}$ (for reference values${\textrm{Im}}[C_8^{NP}] \approx 10^{-3}$). In addition, it is pointed out thatthe ratio of left- to right-handed (photon polarisation) LD amplitudes ismeasurable in time-dependent CP (TDCP) asymmetries. We argue that both theoryand experimental consideration favour weak annihilation (WA) as the dominant LDcontribution. More definite progress could be achieved by either computing theradiative corrections to WA or the measurement of the charged modes$D^+_{(d,s)} \to (\rho,K^{*})^+ \gamma$ and $D_s \to \rho^+ \gamma$.

$A_{\textrm{CP}}[D_{(s)}^{0,+} \to V \gamma]$ from Large ${\cal O}_8$