Star writer supported by Ravel (9)
I believe the answer is:
pentangle
'star' is the definition.
(I've seen this before)
'writer supported by ravel' is the wordplay.
'writer' becomes 'pen' (something which writes).
'supported by' is a charade indicator (letters next to each other) (in a down clue, some letters hold up others).
'ravel' becomes 'tangle' (synonyms).
'pen'+'tangle'='PENTANGLE'
(Other definitions for pentangle that I've seen before include "Five-pointed star" , "mystic symbol" , "Pentagram" .)