Artist steps around one for light (8)
I believe the answer is:
Here is my best explanation:
'light' is the definition.
(radiance is a kind of light)
'artist steps around one' is the wordplay.
'artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'steps' becomes 'dance' ('dance step' can be a synonym of 'step').
'around' is an insertion indicator.
'one' becomes 'i' (Roman numeral).
'dance' placed around 'i' is 'diance'.
'for' is the link.