Artist set out, climbing out of the centre (6)
I believe the answer is:
radial
'the centre' is the definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps you can see an association between them that I don't see?
'artist set out climbing' is the wordplay.
'artist' becomes 'RA' (Royal Academician, member of Royal Academy of Arts).
'set out' becomes 'laid' (I've seen this before).
'climbing' shows that the letters should be reversed in order (in a down clue, letters climb up).
'laid' back-to-front is 'dial'.
'ra'+'dial'='RADIAL'
'out of' acts as a link.
Can you help me to learn more?
(Other definitions for radial that I've seen before include "Arranged like wheel spokes" , "Kind of pneumatic tyre" , "Coming from centre" , "Emanating from a central point" , "Set out as wheel spokes" .)