Planet seen by an upstart artist at sunrise (6)
I believe the answer is:
Here is my best explanation:
'planet' is the definition.
(Uranus is an example)
'by an upstart artist at sunrise' is the wordplay.
'by' says to put letters next to each other.
'an upstart' becomes 'u' (start of the word 'up').
'artist' becomes 'ra' (Royal Academician, member of Royal Academy of Arts).
'at sunrise' becomes 'nus' (I can't explain this - if you can you should give a lot more credence to this answer).
'u' next to 'ra' is 'ura'.
'seen' acts as a link.