  We study the 37 brightest radio sources in the Subaru/XMM-Newton Deep Field
(SXDF). Using mid-IR (Spitzer MIPS 24 micron) data we expect to trace nuclear
accretion activity, even if it is obscured at optical wavelengths, unless the
obscuring column is extreme. Our results suggest that above the `FRI/FRII'
radio luminosity break most of the radio sources are associated with objects
that have excess mid-IR emission, only some of which are broad-line objects,
although there is one clear low-accretion-rate FRI. The fraction of objects
with mid-IR excess drops dramatically below the FRI/FRII break, although there
exists at least one high-accretion-rate QSO. Investigation of mid-IR and blue
excesses shows that they are correlated as predicted by a model in which a
torus of dust absorbs ~30% of the light, and the dust above and below the torus
scatters >~1% of the light.
