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Using a sample of 2922 z<0.2, spectroscopically-identified Active GalacticNuclei (AGN) we explore the relationship between radio size and the prevalenceof extreme ionised outflows, as traced using broad [O III] emission-lineprofiles in Sloan Digital Sky Survey (SDSS) spectra. To classify radio sourcesas compact or extended, we combine a machine-learning technique ofmorphological classification with size measurements from two-dimensionalGaussian models to data from all-sky radio surveys. We find that the twopopulations have statistically different [O III] emission-line profiles, withthe compact sources tending to have the most extreme gas kinematics. When theradio emission is confined within 3" (i.e., within the spectroscopic fibre or~<5kpc at the median redshift), there is twice the chance of observing broad [OIII] emission-line components, indicative of very high velocity outflows, withFWHM>1000 km/s. This difference is most enhanced for the highest radioluminosity bin of log[L(1.4GHz)/(W/Hz)]=23.5-24.5 where the AGN dominate theradio emission; specifically, >1000 km/s components are almost four-times aslikely when the radio emission is compact in this subsample. Our follow-up~0.3"-1" resolution radio observations, for a subset of targets in thisluminosity range, reveal that radio jets and lobes are prevalent, and suggestthat compact jets might be responsible for the enhanced outflows in the widersample. Our results are limited by the available, relatively shallow, all-skyradio surveys; however, forthcoming surveys will provide a more completepicture on the connection between radio emission and outflows. Overall, ourresults add to the growing body of evidence that there is a close connectionbetween ionised outflows and compact radio emission in highly accreting`radiative' AGN, possibly due to young or frustrated, lower-power radio jets.

Extreme ionised outflows are more common when the radio emission is compact in AGN host galaxies